| County : | Jefferson County |
| State : | Montana (MT) |
| Land Area : | 1,656.25 sq mi |
| Water Area : | 2.58 sq mi |
| Latitude : | 46.1265574 |
| Longitude : | -112.0567713 |
| Population (2010): | 11,406 |
| Population Estimate (2012) : | 11,360 |
| Population Density : | 6.89/sq mi |
| Housing Units (2012) : | 5,055 |
| Median Household Income (2012) : | $60,459 (Montana : $45,456, USA : $53,046) |
| Median Family Income (2012) : | $78,025 (Montana : $58,951, USA : $64,585) |
| Median House Price (2012) : | $230,200 (Montana : $183,000, USA : $181,400) |
Jefferson County Cities / Towns
| Basin (212) | Boulder City (1,183) | Cardwell (50) |
| Clancy (1,661) | Elkhorn (10) | Jefferson City (472) |
| Montana City (2,715) | Rader Creek (363) | South Hills (517) |
| Whitehall Town (1,038) |
Jefferson County Zip Codes
| 59601 (29,283) | 59631 (237) | 59632 (1,939) |
| 59634 (4,819) | 59635 (7,282) | 59638 (617) |
| 59701 (33,147) | 59721 (433) | 59752 (3,431) |
| 59759 (3,643) |