County · Montana · United States
Jefferson County ZIP codes
6 ZIP codes · 6 cities · FIPS 30043
Key facts
- State
- Montana (MT)
- FIPS code
- 30043
- Population
- 12,501
- Median household income
- $76,576
- Median age
- 47.3
- Land area
- 1,657 sq mi (4,291.6 km²)
- Population density
- 8 / sq mi
- Area codes
- 406
Cities and ZIP codes in Jefferson County (6)
| City | ZIP codes |
|---|---|
| Basin | 59631 |
| Boulder | 59632 |
| Cardwell | 59721 |
| Clancy | 59634 |
| Jefferson City | 59638 |
| Whitehall | 59759 |
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.