Founded in February 2, 1865, Missoula County is one of 56 counties in the state of Montana. Historically, Missoula County was one of the 9 original counties. The city of Missoula is the county seat. With FIPS code of 63, Missoula County has a population of 119,533 and area of 2,598 square miles (6,729 km2).
List of all cities in Missoula County, MT alphabetically
| City/Town | Postal Code | Area Code |
| Bonner, MT | 59823 | 406 |
| Clinton, MT | 59825 | 406 |
| Condon, MT | 59826 | 406 |
| East Missoula, MT | 59801 | 406 |
| Frenchtown, MT | 59834 | 406 |
| Greenough, MT | 59823 | 406 |
| Huson, MT | 59846 | 406 |
| Lolo, MT | 59847 | 406 |
| Milltown, MT | 59851 | 406 |
| Missoula, MT | 59801 | 406 |
| 59802 | 406 | |
| 59803 | 406 | |
| 59804 | 406 | |
| 59806 | 406 | |
| 59807 | 406 | |
| 59808 | 406 | |
| 59812 | 406 | |
| Potomac, MT | 59823 | 406 |
| Seeley Lake, MT | 59868 | 406 |
| Swan Valley, MT | 59826 | 406 |
| The University of Montana Missoula, MT | 59812 | 406 |
| Turah, MT | 59825 | 406 |