{"id":154660,"date":"2022-04-11T13:42:39","date_gmt":"2022-04-11T13:42:39","guid":{"rendered":"https:\/\/sdcmainprod.wpengine.com\/usps\/mail-class-guide\/"},"modified":"2025-11-14T16:51:58","modified_gmt":"2025-11-14T16:51:58","slug":"mail-class-guide","status":"publish","type":"page","link":"https:\/\/www.stamps.com\/usps\/mail-class-guide\/","title":{"rendered":"USPS Mail Class Guide"},"content":{"rendered":"\n<p>The US Postal Service<sup>\u00ae<\/sup> has many different mail classes ranging from regular <a href=\"https:\/\/www.stamps.com\/mail\/first-class-mail\/\">First Class Mail<\/a><sup>\u00ae<\/sup> letter delivery to overnight expedited services such as Priority Mail Express<sup>\u00ae<\/sup>. Here is a breakdown of each USPS service to help you choose the right mail class for your mailpiece.<br>\n    <div class=\"table-wrapper\" data-table-id=\"156286\">\n\n        \n            <!-- BEGIN TABLE -->\n                        <div class=\"table regular-table align-text-default \" role=\"table\">\n                \n                <!-- Begin Table Title -->\n                                    <div class=\"t-title\" role=\"row\">\n                                                    <div class=\"t-row lake\" role=\"row\">\n                                                                    <div class=\"t-col \"\n                                         style=\"width: 34%\"\n                                         role=\"cell\">\n                                        Mail Class                                    <\/div>\n                                                                    <div class=\"t-col \"\n                                         style=\"width: 12%\"\n                                         role=\"cell\">\n                                        Speed                                    <\/div>\n                                                                    <div class=\"t-col \"\n                                         style=\"width: 16%\"\n                                         role=\"cell\">\n                                        Stamps.com &lt;br\/&gt;Starting Price                                    <\/div>\n                                                                    <div class=\"t-col \"\n                                         style=\"width: 20%\"\n                                         role=\"cell\">\n                                        Cheapest&lt;br\/&gt; Tracking Option\t                                    <\/div>\n                                                                    <div class=\"t-col \"\n                                         style=\"width: 18%\"\n                                         role=\"cell\">\n                                        Restrictions                                    <\/div>\n                                                            <\/div>\n                                            <\/div>\n                                <!-- End Table Title -->\n\n                <!-- Begin Table Header -->\n                                <!-- End Table Header -->\n\n                <!-- Begin Table Body -->\n                                    <div class=\"t-body\">\n                                                    <div class=\"t-row default\" role=\"row\">\n                                                                    <div class=\"t-col\"\n                                         style=\"width: 34%\"\n                                         role=\"cell\" key=\"0\">\n\n                                        <!-- header 1st row, mobile view -->\n                                                                                    \n                                                                                        \n                                        \n                                        <!-- header 2 row, mobile view -->\n                                        \n                                        <!-- column text -->\n                                        <div class=\"column-text\">\n                                                                                            <div class=\"text\">\n                                                                                                        First Class Mail Letter                                                <\/div>\n                                            \n                                                                                    <\/div>\n                                    <\/div>\n                                                                    <div class=\"t-col\"\n                                         style=\"width: 12%\"\n                                         role=\"cell\" key=\"1\">\n\n                                        <!-- header 1st row, mobile view -->\n                                                                                    \n                                                                                        \n                                        \n                                        <!-- header 2 row, mobile view -->\n                                        \n                                        <!-- column text -->\n                                        <div class=\"column-text\">\n                                                                                            <div class=\"text\">\n                                                                                                        1\u20133 days*                                                <\/div>\n                                            \n                                                                                    <\/div>\n                                    <\/div>\n                                                                    <div class=\"t-col\"\n                                         style=\"width: 16%\"\n                                         role=\"cell\" key=\"2\">\n\n                                        <!-- header 1st row, mobile view -->\n                                                                                    \n                                                                                        \n                                        \n                                        <!-- header 2 row, mobile view -->\n                                        \n                                        <!-- column text -->\n                                        <div class=\"column-text\">\n                                                                                            <div class=\"text\">\n                                                                                                        $0.69**                                                <\/div>\n                                            \n                                                                                    <\/div>\n                                    <\/div>\n                                                                    <div class=\"t-col\"\n                                         style=\"width: 20%\"\n                                         role=\"cell\" key=\"3\">\n\n                                        <!-- header 1st row, mobile view -->\n                                                                                    \n                                                                                        \n                                        \n                                        <!-- header 2 row, mobile view -->\n                                        \n                                        <!-- column text -->\n                                        <div class=\"column-text\">\n                                                                                            <div class=\"text\">\n                                                                                                        $4.85 <a href=\"https:\/\/www.stamps.com\/mail\/certified-mail\/\">Certified Mail<\/a><sup>\u2122<\/sup>                                                <\/div>\n                                            \n                                                                                    <\/div>\n                                    <\/div>\n                                                                    <div class=\"t-col\"\n                                         style=\"width: 18%\"\n                                         role=\"cell\" key=\"4\">\n\n                                        <!-- header 1st row, mobile view -->\n                                                                                    \n                                                                                        \n                                        \n                                        <!-- header 2 row, mobile view -->\n                                        \n                                        <!-- column text -->\n                                        <div class=\"column-text\">\n                                                                                            <div class=\"text\">\n                                                                                                        Shape and weight restrictions<sup>\u2020<\/sup>                                                <\/div>\n                                            \n                                                                                    <\/div>\n                                    <\/div>\n                                                            <\/div>\n                                                    <div class=\"t-row default\" role=\"row\">\n                                                                    <div class=\"t-col\"\n                                         style=\"width: 34%\"\n                                         role=\"cell\" key=\"0\">\n\n                                        <!-- header 1st row, mobile view -->\n                                                                                    \n                                                                                        \n                                        \n                                        <!-- header 2 row, mobile view -->\n                                        \n                                        <!-- column text -->\n                                        <div class=\"column-text\">\n                                                                                            <div class=\"text\">\n                                                                                                        First Class Mail Flat                                                <\/div>\n                                            \n                                                                                    <\/div>\n                                    <\/div>\n                                                                    <div class=\"t-col\"\n                                         style=\"width: 12%\"\n                                         role=\"cell\" key=\"1\">\n\n                                        <!-- header 1st row, mobile view -->\n                                                                                    \n                                                                                        \n                                        \n                                        <!-- header 2 row, mobile view -->\n                                        \n                                        <!-- column text -->\n                                        <div class=\"column-text\">\n                                                                                            <div class=\"text\">\n                                                                                                        1\u20133 days*                                                <\/div>\n                                            \n                                                                                    <\/div>\n                                    <\/div>\n                                                                    <div class=\"t-col\"\n                                         style=\"width: 16%\"\n                                         role=\"cell\" key=\"2\">\n\n                                        <!-- header 1st row, mobile view -->\n                                                                                    \n                                                                                        \n                                        \n                                        <!-- header 2 row, mobile view -->\n                                        \n                                        <!-- column text -->\n                                        <div class=\"column-text\">\n                                                                                            <div class=\"text\">\n                                                                                                        $1.50                                                <\/div>\n                                            \n                                                                                    <\/div>\n                                    <\/div>\n                                                                    <div class=\"t-col\"\n                                         style=\"width: 20%\"\n                                         role=\"cell\" key=\"3\">\n\n                                        <!-- header 1st row, mobile view -->\n                                                                                    \n                                                                                        \n                                        \n                                        <!-- header 2 row, mobile view -->\n                                        \n                                        <!-- column text -->\n                                        <div class=\"column-text\">\n                                                                                            <div class=\"text\">\n                                                                                                        $4.85 Certified Mail\t                                                <\/div>\n                                            \n                                                                                    <\/div>\n                                    <\/div>\n                                                                    <div class=\"t-col\"\n                                         style=\"width: 18%\"\n                                         role=\"cell\" key=\"4\">\n\n                                        <!-- header 1st row, mobile view -->\n                                                                                    \n                                                                                        \n                                        \n                                        <!-- header 2 row, mobile view -->\n                                        \n                                        <!-- column text -->\n                                        <div class=\"column-text\">\n                                                                                            <div class=\"text\">\n                                                                                                        Shape and weight restrictions<sup>\u2020<\/sup>                                                <\/div>\n                                            \n                                                                                    <\/div>\n                                    <\/div>\n                                                            <\/div>\n                                                    <div class=\"t-row default\" role=\"row\">\n                                                                    <div class=\"t-col\"\n                                         style=\"width: 34%\"\n                                         role=\"cell\" key=\"0\">\n\n                                        <!-- header 1st row, mobile view -->\n                                                                                    \n                                                                                        \n                                        \n                                        <!-- header 2 row, mobile view -->\n                                        \n                                        <!-- column text -->\n                                        <div class=\"column-text\">\n                                                                                            <div class=\"text\">\n                                                                                                        Priority Mail<sup>\u00ae<\/sup>                                                <\/div>\n                                            \n                                                                                    <\/div>\n                                    <\/div>\n                                                                    <div class=\"t-col\"\n                                         style=\"width: 12%\"\n                                         role=\"cell\" key=\"1\">\n\n                                        <!-- header 1st row, mobile view -->\n                                                                                    \n                                                                                        \n                                        \n                                        <!-- header 2 row, mobile view -->\n                                        \n                                        <!-- column text -->\n                                        <div class=\"column-text\">\n                                                                                            <div class=\"text\">\n                                                                                                        1\u20133 days*                                                <\/div>\n                                            \n                                                                                    <\/div>\n                                    <\/div>\n                                                                    <div class=\"t-col\"\n                                         style=\"width: 16%\"\n                                         role=\"cell\" key=\"2\">\n\n                                        <!-- header 1st row, mobile view -->\n                                                                                    \n                                                                                        \n                                        \n                                        <!-- header 2 row, mobile view -->\n                                        \n                                        <!-- column text -->\n                                        <div class=\"column-text\">\n                                                                                            <div class=\"text\">\n                                                                                                        From $9.25**                                                <\/div>\n                                            \n                                                                                    <\/div>\n                                    <\/div>\n                                                                    <div class=\"t-col\"\n                                         style=\"width: 20%\"\n                                         role=\"cell\" key=\"3\">\n\n                                        <!-- header 1st row, mobile view -->\n                                                                                    \n                                                                                        \n                                        \n                                        <!-- header 2 row, mobile view -->\n                                        \n                                        <!-- column text -->\n                                        <div class=\"column-text\">\n                                                                                            <div class=\"text\">\n                                                                                                        Free <a href=\"https:\/\/www.stamps.com\/shipping\/usps\/tracking\/\">USPS Tracking<\/a>**                                                <\/div>\n                                            \n                                                                                    <\/div>\n                                    <\/div>\n                                                                    <div class=\"t-col\"\n                                         style=\"width: 18%\"\n                                         role=\"cell\" key=\"4\">\n\n                                        <!-- header 1st row, mobile view -->\n                                                                                    \n                                                                                        \n                                        \n                                        <!-- header 2 row, mobile view -->\n                                        \n                                        <!-- column text -->\n                                        <div class=\"column-text\">\n                                                                                            <div class=\"text\">\n                                                                                                        N\/A                                                <\/div>\n                                            \n                                                                                    <\/div>\n                                    <\/div>\n                                                            <\/div>\n                                                    <div class=\"t-row default\" role=\"row\">\n                                                                    <div class=\"t-col\"\n                                         style=\"width: 34%\"\n                                         role=\"cell\" key=\"0\">\n\n                                        <!-- header 1st row, mobile view -->\n                                                                                    \n                                                                                        \n                                        \n                                        <!-- header 2 row, mobile view -->\n                                        \n                                        <!-- column text -->\n                                        <div class=\"column-text\">\n                                                                                            <div class=\"text\">\n                                                                                                        Priority Mail Express<sup>\u00ae<\/sup>                                                <\/div>\n                                            \n                                                                                    <\/div>\n                                    <\/div>\n                                                                    <div class=\"t-col\"\n                                         style=\"width: 12%\"\n                                         role=\"cell\" key=\"1\">\n\n                                        <!-- header 1st row, mobile view -->\n                                                                                    \n                                                                                        \n                                        \n                                        <!-- header 2 row, mobile view -->\n                                        \n                                        <!-- column text -->\n                                        <div class=\"column-text\">\n                                                                                            <div class=\"text\">\n                                                                                                        1\u20132 days*                                                <\/div>\n                                            \n                                                                                    <\/div>\n                                    <\/div>\n                                                                    <div class=\"t-col\"\n                                         style=\"width: 16%\"\n                                         role=\"cell\" key=\"2\">\n\n                                        <!-- header 1st row, mobile view -->\n                                                                                    \n                                                                                        \n                                        \n                                        <!-- header 2 row, mobile view -->\n                                        \n                                        <!-- column text -->\n                                        <div class=\"column-text\">\n                                                                                            <div class=\"text\">\n                                                                                                        $30.65**                                                <\/div>\n                                            \n                                                                                    <\/div>\n                                    <\/div>\n                                                                    <div class=\"t-col\"\n                                         style=\"width: 20%\"\n                                         role=\"cell\" key=\"3\">\n\n                                        <!-- header 1st row, mobile view -->\n                                                                                    \n                                                                                        \n                                        \n                                        <!-- header 2 row, mobile view -->\n                                        \n                                        <!-- column text -->\n                                        <div class=\"column-text\">\n                                                                                            <div class=\"text\">\n                                                                                                        Free USPS Tracking**                                                <\/div>\n                                            \n                                                                                    <\/div>\n                                    <\/div>\n                                                                    <div class=\"t-col\"\n                                         style=\"width: 18%\"\n                                         role=\"cell\" key=\"4\">\n\n                                        <!-- header 1st row, mobile view -->\n                                                                                    \n                                                                                        \n                                        \n                                        <!-- header 2 row, mobile view -->\n                                        \n                                        <!-- column text -->\n                                        <div class=\"column-text\">\n                                                                                            <div class=\"text\">\n                                                                                                        N\/A                                                <\/div>\n                                            \n                                                                                    <\/div>\n                                    <\/div>\n                                                            <\/div>\n                                                    <div class=\"t-row default\" role=\"row\">\n                                                                    <div class=\"t-col\"\n                                         style=\"width: 34%\"\n                                         role=\"cell\" key=\"0\">\n\n                                        <!-- header 1st row, mobile view -->\n                                                                                    \n                                                                                        \n                                        \n                                        <!-- header 2 row, mobile view -->\n                                        \n                                        <!-- column text -->\n                                        <div class=\"column-text\">\n                                                                                            <div class=\"text\">\n                                                                                                        Media Mail<sup>\u00ae<\/sup>                                                <\/div>\n                                            \n                                                                                    <\/div>\n                                    <\/div>\n                                                                    <div class=\"t-col\"\n                                         style=\"width: 12%\"\n                                         role=\"cell\" key=\"1\">\n\n                                        <!-- header 1st row, mobile view -->\n                                                                                    \n                                                                                        \n                                        \n                                        <!-- header 2 row, mobile view -->\n                                        \n                                        <!-- column text -->\n                                        <div class=\"column-text\">\n                                                                                            <div class=\"text\">\n                                                                                                        2\u20139 days*                                                <\/div>\n                                            \n                                                                                    <\/div>\n                                    <\/div>\n                                                                    <div class=\"t-col\"\n                                         style=\"width: 16%\"\n                                         role=\"cell\" key=\"2\">\n\n                                        <!-- header 1st row, mobile view -->\n                                                                                    \n                                                                                        \n                                        \n                                        <!-- header 2 row, mobile view -->\n                                        \n                                        <!-- column text -->\n                                        <div class=\"column-text\">\n                                                                                            <div class=\"text\">\n                                                                                                        $4.63 and up                                                 <\/div>\n                                            \n                                                                                    <\/div>\n                                    <\/div>\n                                                                    <div class=\"t-col\"\n                                         style=\"width: 20%\"\n                                         role=\"cell\" key=\"3\">\n\n                                        <!-- header 1st row, mobile view -->\n                                                                                    \n                                                                                        \n                                        \n                                        <!-- header 2 row, mobile view -->\n                                        \n                                        <!-- column text -->\n                                        <div class=\"column-text\">\n                                                                                            <div class=\"text\">\n                                                                                                        Free USPS Tracking**                                                <\/div>\n                                            \n                                                                                    <\/div>\n                                    <\/div>\n                                                                    <div class=\"t-col\"\n                                         style=\"width: 18%\"\n                                         role=\"cell\" key=\"4\">\n\n                                        <!-- header 1st row, mobile view -->\n                                                                                    \n                                                                                        \n                                        \n                                        <!-- header 2 row, mobile view -->\n                                        \n                                        <!-- column text -->\n                                        <div class=\"column-text\">\n                                                                                            <div class=\"text\">\n                                                                                                        Content restrictions apply                                                <\/div>\n                                            \n                                                                                    <\/div>\n                                    <\/div>\n                                                            <\/div>\n                                            <\/div>\n                                <!-- End Table Body -->\n\n                <!-- Begin Table Footer -->\n                                <!-- End Table Footer -->\n\n                <!-- Begin Table Note -->\n                                    <div class=\"table-note\">\n                        <p>* The USPS does not guarantee delivery times for any service except Priority Mail Express.<br \/>\n** Prices listed are discounted rates available for online postage vendors such as Stamps.com.<br \/>\n\u2020 First Class Mail has many size and weight restrictions. Get more information on USPS First Class Mail Characteristics.<\/p>\n                    <\/div>\n                                <!-- End Table Note -->\n\n            <\/div>\n                        <!-- END TABLE -->\n            <\/div>\n\n    <\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-first-class-mail\">First Class Mail<\/h3>\n\n\n\n<div class=\"row\">\n<div class=\"col-sm-12 col-md-6\">\n<p><strong>Pros:<\/strong><\/p>\n<ul>\n<li>Low-cost and fast \u2014 great value for letter mailings.<\/li>\n<li>Pricing not affected by distance.<\/li>\n<li>No fuel or home delivery surcharges.<\/li>\n<\/ul>\n<\/div>\n<div class=\"col-sm-12 col-md-6\">\n<p><strong>Cons:<\/strong><\/p>\n<ul>\n<li>Maximum weight is only 3.5 oz.<\/li>\n<li>First Class Mail letters are not eligible for USPS Tracking.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n\n\n\n<p><strong>When to use First-Class Mail<sup>\u00ae<\/sup>:<\/strong> If your mail is less than 3.5 oz. and you do not need overnight delivery, use First-Class Mail<sup>\u00ae<\/sup>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-priority-mail\">Priority Mail<sup>\u00ae<\/sup><\/h3>\n\n\n\n<div class=\"row\">\n<div class=\"col-sm-12 col-md-6\">\n<p><strong>Pros:<\/strong><\/p>\n<ul>\n<li>1\u20133 day delivery nationwide for packages.<\/li>\n<li>A variety of flat-rate options to simplify shipping.<\/li>\n<li>USPS provides free packaging.<\/li>\n<li>Free USPS Tracking.<\/li>\n<li>Moderate pricing.<\/li>\n<li>Packages can weigh up to 70 lbs.<\/li>\n<li>No fuel or home delivery surcharges.<\/li>\n<\/ul>\n<\/div>\n<div class=\"col-sm-12 col-md-6\">\n<p><strong>Cons:<\/strong><\/p>\n<ul>\n<li>More expensive than other lower-cost USPS mail classes.<\/li>\n<li>Less expensive options, such as First Class Mail<sup>\u00ae<\/sup>, may be equally as fast.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n\n\n\n<p><strong>When to use Priority Mail<sup>\u00ae<\/sup>:<\/strong> If you are shipping more than 13 oz., Priority Mail<sup>\u00ae<\/sup> is a great shipping option for fast delivery at a low price \u2014 the USPS even offers free packaging!<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-priority-mail-express\">Priority Mail Express<sup>\u00ae<\/sup><\/h3>\n\n\n\n<div class=\"row\">\n<div class=\"col-sm-12 col-md-6\">\n<p><strong>Pros:<\/strong><\/p>\n<ul>\n<li>Overnight delivery 365 days\/year.<\/li>\n<li>USPS provides free packaging.<\/li>\n<li>The only USPS method with guaranteed delivery dates.<\/li>\n<li>Packages can weigh up to 70 lbs.<\/li>\n<li>No fuel or home delivery surcharges.<\/li>\n<\/ul>\n<\/div>\n<div class=\"col-sm-12 col-md-6\">\n<p><strong>Cons:<\/strong><\/p>\n<ul>\n<li>Most expensive USPS Mail Class.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n\n\n\n<p><strong>When to use Priority Mail Express<sup>\u00ae<\/sup>:<\/strong> If you need your package to be delivered as fast as possible, regardless of price, use Priority Mail Express<sup>\u00ae<\/sup>. If delivery can wait a day or two, First-Class Mail<sup>\u00ae<\/sup> and Priority Mail<sup>\u00ae<\/sup> are much cheaper options.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-media-mail\">Media Mail<\/h3>\n\n\n\n<div class=\"row\">\n<div class=\"col-sm-12 col-md-6\">\n<p><strong>Pros:<\/strong><\/p>\n<ul>\n<li>Cheapest shipping service for anything over 13 oz.<\/li>\n<li>Pricing is based on weight, not distance.<\/li>\n<li>Packages can weigh up to 70 lbs.<\/li>\n<li>No fuel or home delivery surcharges.<\/li>\n<\/ul>\n<\/div>\n<div class=\"col-sm-12 col-md-6\">\n<p><strong>Cons:<\/strong><\/p>\n<ul>\n<li>Much slower than most other mail classes.<\/li>\n<li>Content must be books, sound recordings, recorded video tapes, printed music, or recorded computer-readable media (such as CDs, DVDs, and diskettes).<\/li>\n<\/ul>\n<\/div>\n<\/div>\n\n\n\n<p><strong>When to use Media Mail:<\/strong> Perfect for media such as books or DVDs when lower shipping rates are more important than delivery speed.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-standard-post\">Standard Post<\/h3>\n\n\n\n<div class=\"row\">\n<div class=\"col-sm-12 col-md-6\">\n<p><strong>Pros:<\/strong><\/p>\n<ul>\n<li>Inexpensive pricing based only on weight (not distance).<\/li>\n<li>Packages can weigh up to 70 lbs.<\/li>\n<li>No fuel or home delivery surcharges.<\/li>\n<\/ul>\n<\/div>\n<div class=\"col-sm-12 col-md-6\">\n<p><strong>Cons:<\/strong><\/p>\n<ul>\n<li>Much slower than most other mail classes.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n\n\n\n<p><strong>When to use Standard Post:<\/strong> Use Standard Post when your content does not qualify for Media Mail and lower shipping rates are more important than speed.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-how-to-send-mail-for-each-mail-class\">How to send mail for each mail class<\/h3>\n\n\n\n<p>With Stamps.com, you can <a href=\"https:\/\/www.stamps.com\/mail\/print-stamps-online\/\">print postage<\/a> for any USPS mail class without a trip to the Post Office. Customers also have access to discounted postage rates for Priority Mail<sup>\u00ae<\/sup> and Priority Mail Express<sup>\u00ae<\/sup>, SCAN form printing, and the ability to import order data from ecommerce marketplaces such as eBay, Amazon, and other popular shopping carts.<\/p>\n\n\n","protected":false},"excerpt":{"rendered":"<p>The US Postal Service\u00ae has many different mail classes ranging from regular First Class Mail\u00ae letter delivery to overnight expedited services such as Priority Mail Express\u00ae. Here is a breakdown of each USPS service to help you choose the right mail class for your mailpiece. First Class Mail Pros: Low-cost and fast \u2014 great value [&hellip;]<\/p>\n","protected":false},"author":71,"featured_media":0,"parent":155747,"menu_order":0,"comment_status":"open","ping_status":"open","template":"","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"class_list":["post-154660","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.1 (Yoast SEO v25.7) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Stamps.com - USPS Mail Class Guide, US Postal Service Mail Classes<\/title>\n<meta name=\"description\" content=\"USPS mail class descriptions, info on different types of mail classes and delivery times offered from US Postal Service.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.stamps.com\/usps\/mail-class-guide\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"USPS Mail Class Guide\" \/>\n<meta property=\"og:description\" content=\"USPS mail class descriptions, info on different types of mail classes and delivery times offered from US Postal Service.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.stamps.com\/usps\/mail-class-guide\/\" \/>\n<meta property=\"og:site_name\" content=\"Stamps.com\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/stampscom\/\" \/>\n<meta property=\"article:modified_time\" content=\"2025-11-14T16:51:58+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.stamps.com\/wp-content\/uploads\/2025\/04\/img-stamps-PreviewTile-1200x675-1.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"675\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:site\" content=\"@stampscom\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.stamps.com\/usps\/mail-class-guide\/\",\"url\":\"https:\/\/www.stamps.com\/usps\/mail-class-guide\/\",\"name\":\"Stamps.com - 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