Founded in 1915, Slope County is one of 53 counties in the state of North Dakota. The city of Amidon is the county seat. With FIPS code of 87, Slope County has a population of 690 and area of 1,218 square miles (3,155 km2).
List of all cities in Slope County, ND alphabetically
| City/Town | Postal Code | Area Code |
| Amidon, ND | 58620 | 701 |
| Marmarth, ND | 58643 | 701 |