County · Missouri · United States
Jefferson County ZIP codes
17 ZIP codes · 17 cities · FIPS 29099
Key facts
- State
- Missouri (MO)
- FIPS code
- 29099
- Population
- 228,227
- Median household income
- $80,522
- Median age
- 40.2
- Land area
- 656.4 sq mi (1,700.2 km²)
- Population density
- 348 / sq mi
- Area codes
- 573, 636
Cities and ZIP codes in Jefferson County (17)
About this page
County figures are Census county-level values (ACS 5-year); the ZIP list shows the ZIPs whose primary county this is — a ZIP on a border can also serve neighbouring counties.
Sources: U.S. Census Bureau (2020 county relationship file, ACS 5-year) · GeoNames. Methodology.