Founded in 1915, Sioux County is one of 53 counties in the state of North Dakota. The city of Fort Yates is the county seat. With FIPS code of 85, Sioux County has a population of 3,738 and area of 1,094 square miles (2,833 km2).
List of all cities in Sioux County, ND alphabetically
| City/Town | Postal Code | Area Code |
| Breien, ND | 58570 | 701 |
| Cannon Ball, ND | 58528 | 701 |
| Fort Yates, ND | 58538 | 701 |
| Selfridge, ND | 58568 | 701 |
| Solen, ND | 58570 | 701 |
| Timmer, ND | 58570 | 701 |