Founded in 1906, Mahnomen County is one of 87 counties in the state of Minnesota. Historically, Mahnomen County was formed from Norman County. The city of Mahnomen is the county seat. With FIPS code of 87, Mahnomen County has a population of 5,414 and area of 556.14 square miles (1,440 km2).
List of all cities in Mahnomen County, MN alphabetically
| City/Town | Postal Code | Area Code |
| Beaulieu, MN | 56557 | 218 |
| Bejou, MN | 56516 | 218 |
| Lengby, MN | 56651 | 218 |
| Mahnomen, MN | 56557 | 218 |
| Naytahwaush, MN | 56566 | 218 |