Founded in February 2, 1865, Deer Lodge County is one of 56 counties in the state of Montana. Historically, Deer Lodge County was one of the 9 original counties. The city of Anaconda is the county seat. With FIPS code of 23, Deer Lodge County has a population of 9,491 and area of 737 square miles (1,909 km2).
List of all cities in Deer Lodge County, MT alphabetically
| City/Town | Postal Code | Area Code |
| Anaconda, MT | 59711 | 406 |
| Fairmont, MT | 59711 | 406 |
| Georgetown, MT | 59711 | 406 |
| Opportunity, MT | 59711 | 406 |
| Warm Springs, MT | 59756 | 406 |