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.
zipcodes.pro — PREFIX/943

ZIP codes starting with 943

ZIP codes
7
States
CA
Largest city
Palo Alto, CA
Population
115,079

The first three digits of a ZIP code identify a sectional center facility — the postal processing plant that sorts mail for the area. It is a mail-routing grouping, not an administrative boundary.

Every ZIP code in 943xx

ZIP codes starting with 943
ZIP City Type Population Median income Median home
94301 Palo Alto , CA Standard 17,508 $242,006 $2,000,000+
94302 Palo Alto , CA No street area — — —
94303 Palo Alto , CA Standard 46,879 $151,609 $1,826,200
94304 Palo Alto , CA Standard 5,000 $154,141 $2,000,000+
94305 Stanford , CA Standard 18,509 $83,088 $2,000,000+
94306 Palo Alto , CA Standard 27,183 $210,000 $2,000,000+
94309 Palo Alto , CA No street area — — —

Cite this page

zipcodes.pro. “ZIP codes starting with 943.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/prefix/943

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