Irion County, Texas

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Irion County is a county located on the Edwards Plateau in the U.S. state of Texas. It is included in the San Angelo, Texas, Metropolitan Statistical Area. Irion County's population was 1,771 as of the 2000 census, Its county seat is Mertzon.[1] The county is named for Robert Anderson Irion, a secretary of state of the Republic of Texas.


History Timeline

  • First inhabitants Tonkawa and Kickapoo.[2]
  • 1650 Captains Hernán Martín and Diego del Castillo explore the region.[3]
  • 1684 Juan Domínguez de Mendoza and Nicolás López report on local Indians.[2]
  • 1761 Spanish soldier Felipe Rábago y Terán passes through the area.[4]
  • 1858 -1861 Butterfield Overland Mail crosses the region.[2]
  • 1876 John Arden brings the first flock of sheep from California. Billy Childress establishes the longhorn 7D Ranch.[5]
  • 1889 The Texas legislature forms Irion County from Tom Green County. Sherwood becomes the county seat.[6]
  • 1928 Oil is discovered in Irion County.[7]
  • 1936 Mertzon becomes county seat.[8]


According to the U.S. Census Bureau, the county has a total area of 1,052 square miles (2,724.7 km2), virtually all of which is land. The Spraberry Trend, the third-largest oil field in the United States by remaining reserves, underlies much of the county.[9]

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