Founded in December 9, 1913, Fallon County is one of 56 counties in the state of Montana. Historically, Fallon County was formed from Custer County. The city of Baker is the county seat. With FIPS code of 25, Fallon County has a population of 3,017 and area of 1,620 square miles (4,196 km2).
List of all cities in Fallon County, MT alphabetically
| City/Town | Postal Code | Area Code |
| Baker, MT | 59313 | 406 |
| Baker, MT | 59354 | 406 |
| Plevna, MT | 59344 | 406 |
| Willard, MT | 59354 | 406 |