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/204

ZIP codes starting with 204

ZIP codes
50
States
DC
Largest city
Washington, DC
Population
15

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 204xx

ZIP codes starting with 204
ZIP City Type Population Median income Median home
20401 Washington , DC No street area — — —
20402 Washington , DC No street area — — —
20403 Washington , DC No street area — — —
20404 Washington , DC No street area — — —
20405 Washington , DC No street area — — —
20406 Washington , DC No street area — — —
20407 Washington , DC No street area — — —
20408 Washington , DC Standard 0 — —
20409 Washington , DC No street area — — —
20410 Washington , DC No street area — — —
20411 Washington , DC No street area — — —
20412 Washington , DC No street area — — —
20413 Washington , DC No street area — — —
20414 Washington , DC No street area — — —
20415 Washington , DC Standard 0 — —
20416 Washington , DC No street area — — —
20417 Washington , DC No street area — — —
20418 Washington , DC Standard 0 — —
20419 Washington , DC No street area — — —
20420 Washington , DC No street area — — —
20421 Washington , DC No street area — — —
20422 Washington , DC Standard 15 — —
20423 Washington , DC No street area — — —
20424 Washington , DC No street area — — —
20425 Washington , DC No street area — — —
20426 Washington , DC No street area — — —
20427 Washington , DC Standard 0 — —
20428 Washington , DC No street area — — —
20429 Washington , DC No street area — — —
20431 Washington , DC Standard 0 — —
20433 Washington , DC No street area — — —
20434 Washington , DC No street area — — —
20435 Washington , DC No street area — — —
20436 Washington , DC No street area — — —
20437 Washington , DC No street area — — —
20439 Washington , DC No street area — — —
20440 Washington , DC No street area — — —
20441 Washington , DC No street area — — —
20442 Washington , DC No street area — — —
20444 Washington , DC No street area — — —
20447 Washington , DC No street area — — —
20451 Washington , DC No street area — — —
20453 Washington , DC No street area — — —
20456 Washington , DC No street area — — —
20460 Washington , DC No street area — — —
20463 Washington , DC No street area — — —
20468 Washington , DC No street area — — —
20469 Washington , DC No street area — — —
20470 Washington , DC No street area — — —
20472 Washington , DC No street area — — —

Cite this page

zipcodes.pro. “ZIP codes starting with 204.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/prefix/204

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