Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.

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ZIP code changes

The USPS adds and retires ZIP codes continuously, and the Census redraws tabulation areas each decade. Each monthly release is diffed against the one before it, and the differences are listed here.

This log starts with the 2026-10-12 data release. ZIP codes that are added, retired or moved appear here month by month.

Current release

Release: 2026-10-12
Built: 2026-10-13 05:45 UTC
ZIP codes: 41,711
With census boundaries: 33,791