| Irion County Texas Cities/Towns - Barnhart, Mertzon (County Seat) |
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![]() Your Ad Here Irion County is a county located in the U.S. state of Texas. Irion County's population was 1,771 as of the 2000 census, Its county seat is Mertzon. History The county is named for Robert Anderson Irion, a secretary of state of the Republic of Texas. ![]() |