Knowledge: ZIP Code™ - The Basics - faq.usps.com
Need to look up a ZIP Code™? Try the ZIP Code™ lookup tool on USPS.com. Note: The ZIP Code™ lookup tool will display the address in USPS standardized format. This may look …
ZIP Code - Wikipedia
The ZIP Code system (an acronym for Zone Improvement Plan[1]) is the system of postal codes used by the United States Postal Service (USPS). The term ZIP was chosen to suggest that …
ZIP Code Meaning & History: Everything You Need to Know
Jun 11, 2025 · What is a ZIP Code? A ZIP Code is a smart system that keeps America’s mail moving efficiently. It was created by the United States Postal Service (USPS) in 1963. ZIP …
What Is a ZIP Code? Definition, ZIP+4, Lookup, and USPS Basics
At its core, a ZIP code is a U.S. postal code that lets the United States Postal Service group addresses into logical clusters so machines and people can sort mail and deliver mail reliably. …
ZIP Code | Postal Addressing, Delivery, Formatting | Britannica
Oct 21, 2025 · ZIP Code, system of zone coding (postal coding) introduced by the U.S. Post Office Department (now the U.S. Postal Service) in 1963 to facilitate the sorting and delivery of …
Understanding Zip Codes in the United States: A Comprehensive …
Jan 9, 2025 · Zip codes, or Zone Improvement Plans, are numerical codes assigned by the United States Postal Service (USPS) to facilitate the efficient delivery of mail. Introduced in 1963, …
What is Zip Code and How Do Zip Codes Work? - PostGrid
As the name suggests, the US ZIP code list lists ZIP codes of all the addresses inside the United States. The USPS maintains the US ZIP codes list because it is the official postal authority of …
What is a ZIP Code? Origins, Formats, and Applications.
Jul 30, 2024 · What is a ZIP Code in the US? In the US, ZIP Code stands for “Zone Improvement Plan Code,” a postal code system introduced by USPS to efficiently organize mail delivery by …
ZIP Code Meaning: What the Numbers Mean & How They Work
Jun 21, 2025 · ZIP codes are structured to provide a systematic way of identifying geographic locations for efficient mail delivery. The standard ZIP code consists of five digits, while an …
ZIP Code Lookup: How to Find the Right ZIP Code for Any Address
Jan 25, 2025 · Learn how to find the correct ZIP Code using USPS tools, understand ZIP+4 codes, avoid common mistakes, and prevent mail delays or returns.