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Learn how to check the validity and deliverability of a physical mailing address in the US and the UK. Compare the methods, benefits and providers of postal address verification services.
A postal code is a series of letters or digits used to identify a location for the purpose of sorting mail. This web page shows an overview of postal code notation schemes for all countries that have them.
Learn about the history, operations, and challenges of the USPS, an independent agency of the federal government that provides postal service in the U.S. and its territories. Find out how the USPS delivers mail and packages, operates its fleet, and faces financial and legal issues.
ZIP Code Tabulation Areas (ZCTAs) are statistical entities developed by the U.S. Census Bureau for tabulating summary statistics. They are generalized area representations of the U.S. Postal Service (USPS) ZIP code service areas, but are not the same as ZIP codes.
A ZIP Code is a system of postal codes used by the United States Postal Service to sort and deliver mail more efficiently. It consists of five digits, followed by an optional four-digit extension called ZIP+4.
Find the three-digit ZIP code prefix, the state, and the USPS Sectional Center Facility for each ZIP code in the United States. The web page does not show the five-digit ZIP codes for each prefix, but you can use the table to locate them.
LACS stands for Locatable Address Conversion System, a service that updates mailing addresses when a street is renamed or the address is updated for 911. Learn how LACS works, who uses it, and how to license the LACS data from the USPS.
Rural Free Delivery vehicle (from Popular Mechanics, September 1905). Rural Free Delivery (RFD), since 1906 officially rural delivery, is a program of the United States Post Office Department to deliver mail directly to rural destinations.