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/645

ZIP codes starting with 645

ZIP codes
8
States
MO
Largest city
Saint Joseph, MO
Population
82,270

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 645xx

ZIP codes starting with 645
ZIP City Type Population Median income Median home
64501 Saint Joseph , MO Standard 10,689 $46,731 $98,600
64502 Saint Joseph , MO No street area — — —
64503 Saint Joseph , MO Standard 11,954 $53,039 $140,500
64504 Saint Joseph , MO Standard 10,068 $58,801 $127,100
64505 Saint Joseph , MO Standard 14,107 $73,298 $191,100
64506 Saint Joseph , MO Standard 21,461 $65,573 $240,300
64507 Saint Joseph , MO Standard 13,991 $61,158 $140,300
64508 Saint Joseph , MO No street area — — —

Cite this page

zipcodes.pro. “ZIP codes starting with 645.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/prefix/645

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