Founded in 1889, Irion County is one of 254 counties in the state of Texas. Historically, Irion County was formed from Tom Green County. The city of Mertzon is the county seat. With FIPS code of 235, Irion County has a population of 1,552 and area of 1,052 square miles (2,725 km2).
List of all cities in Irion County, TX alphabetically
| City/Town | Postal Code | Area Code |
| Barnhart, TX | 76930 | 325 |
| Mertzon, TX | 76941 | 325 |
| Sherwood, TX | 76941 | 325 |