Founded in 1875, Traill County is one of 53 counties in the state of North Dakota. The city of Hillsboro is the county seat. With FIPS code of 97, Traill County has a population of 8,003 and area of 862 square miles (2,233 km2).
List of all cities in Traill County, ND alphabetically
| City/Town | Postal Code | Area Code |
| Blanchard, ND | 58009 | 701 |
| Buxton, ND | 58218 | 701 |
| Caledonia, ND | 58219 | 701 |
| Clifford, ND | 58016 | 701 |
| Cummings, ND | 58223 | 701 |
| Galesburg, ND | 58035 | 701 |
| Hatton, ND | 58240 | 701 |
| Hillsboro, ND | 58045 | 701 |
| Kelso, ND | 58045 | 701 |
| Mayville, ND | 58257 | 701 |
| Portland, ND | 58274 | 701 |