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/904

ZIP codes starting with 904

ZIP codes
11
States
CA
Largest city
Santa Monica, CA
Population
93,581

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 904xx

ZIP codes starting with 904
ZIP City Type Population Median income Median home
90401 Santa Monica , CA Standard 8,101 $110,385 $1,149,200
90402 Santa Monica , CA Standard 11,337 $159,100 $2,000,000+
90403 Santa Monica , CA Standard 23,867 $121,925 $1,548,900
90404 Santa Monica , CA Standard 22,978 $95,139 $1,244,400
90405 Santa Monica , CA Standard 27,298 $121,241 $1,929,900
90406 Santa Monica , CA No street area — — —
90407 Santa Monica , CA No street area — — —
90408 Santa Monica , CA No street area — — —
90409 Santa Monica , CA No street area — — —
90410 Santa Monica , CA No street area — — —
90411 Santa Monica , CA No street area — — —

Cite this page

zipcodes.pro. “ZIP codes starting with 904.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/prefix/904

Underlying data is public domain or openly licensed — sources, vintages and licences.