Founded in 1858, Hardeman County is one of 254 counties in the state of Texas. Historically, Hardeman County was formed from Fannin County. The city of Quanah is the county seat. With FIPS code of 197, Hardeman County has a population of 3,552 and area of 695 square miles (1,800 km2).
List of all cities in Hardeman County, TX alphabetically
| City/Town | Postal Code | Area Code |
| Chillicothe, TX | 79225 | 254 |
| Quanah, TX | 79252 | 254 |