Founded in February 29, 1912, Blaine County is one of 56 counties in the state of Montana. Historically, Blaine County was formed from Chouteau County. The city of Chinook is the county seat. With FIPS code of 5, Blaine County has a population of 6,980 and area of 4,226 square miles (10,945 km2).
List of all cities in Blaine County, MT alphabetically
| City/Town | Postal Code | Area Code |
| Chinook, MT | 59523 | 406 |
| 59535 | 406 | |
| Harlem, MT | 59526 | 406 |
| Hays, MT | 59527 | 406 |
| Hogeland, MT | 59529 | 406 |
| Lloyd, MT | 59535 | 406 |
| Turner, MT | 59542 | 406 |
| Zurich, MT | 59547 | 406 |