Use our address lookup or code list to find the correct 5-digit or 9-digit (ZIP+4) code for your postal mails destination.

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United States Zip Codes provides a free zip code map and list of zip codes by state. Find zip codes by address, zip codes by city, or zip codes by state.

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 …

Oct 1, 2025 · List of all Zip Codes for the state of Maryland, MD. Includes all counties and cities in Maryland.

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 …

Oct 15, 2025 · Potomac Maryland is covered by a total of 2 ZIP Codes. There are also 2 ZIP Codes that overlap Potomac but have a different postal city name. The ZIP Codes in Potomac …

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 …

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 …

Jul 12, 2025 · What Exactly is a ZIP Code? The sequence of numbers at the end of an address holds a significant purpose. The acronym “ZIP” stands for Zone Improvement Plan. The USPS …