Dallam County is the north-westernmost county in the U.S. state of Texas. As of the 2020 Census, its population was 7,115. Its county seat is Dalhart. The county was founded in 1876 and later organized in 1891. It is named for James Wilmer Dallam, a lawyer and newspaper publisher.

Bowie County is a county in the U.S. state of Texas. Its legal county seat is Boston, though its courthouse is located in New Boston. As of the 2020 census, the population was 92,893. Bowie County is part of the Texarkana metropolitan statistical area. The county is named for James Bowie, the legendary knife fighter who died at the Battle of the Alamo.