Founded in 1907, Texas County is one of 77 counties in the state of Oklahoma. Historically, Texas County was formed from Seventh County (entire panhandle until 1907). The city of Guymon is the county seat. With FIPS code of 139, Texas County has a population of 20,865 and area of 2,037 square miles (5,276 km2).
List of all cities in Texas County, OK alphabetically
| City/Town | Postal Code | Area Code |
| Adams, OK | 73901 | 580 |
| Goodwell, OK | 73939 | 580 |
| Guymon, OK | 73942 | 580 |
| Hardesty, OK | 73944 | 580 |
| Hooker, OK | 73945 | 580 |
| Optima, OK | 73945 | 580 |
| Texhoma, OK | 73949 | 580 |
| Tyrone, OK | 73951 | 580 |