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USPS offers express and standard mail services for different needs and budgets. Learn about delivery speed, price, tracking, insurance, and more for Priority Mail Express, Priority Mail, USPS Ground Advantage, First-Class Mail, and Media Mail.
Learn about the changes to Standard Mail prices and mail preparation standards, including ECR letters, for automation and nonautomation mail. Find out the new requirements for shape, size, thickness, barcoding, and address matching for ECR letters and flats.
Learn how to write the return and delivery addresses on envelopes and postcards for domestic mail in the U.S. See size and weight requirements, postage rates, and special tips for Puerto Rico, Virgin Islands, and military addresses.
Enter your tracking number to see the status of your package and where it is located. You can also leave delivery instructions, such as where to leave a package or send it to a different address, on the tracking results page.
Learn how to send envelopes and postcards with First-Class Mail service, which delivers in 1–5 business days. Find out the prices, features, and requirements for different mailpiece sizes and shapes, and buy stamps online or at a post office.
USPS.com FAQs
Learn how to ship letters, cards, and packages with USPS using Click-N-Ship, stamps, or other services. Compare domestic and international mail and shipping options by speed, price, and features.
Learn about the different classes of mail offered by the US Postal Service, their features, service levels, prices, and presort requirements. Compare the classes of mail based on speed, cost, free forwarding, return, extra services, and incentives.
Learn the size requirements for letters to mail at the lowest price. A letter must be rectangular, at least 3-1/2 inches high x 5 inches long x 0.007 inch thick, and no more than 6-1/8 inches high x 11-1/2 inches long x 1/4 inch thick.
Learn how to format and standardize postal addresses in the United States and Puerto Rico. This publication covers address elements, address types, address formats, address data elements, and address information systems products and services.