Yoakum County is a county located in the far western portion of the U.S. state of Texas. As of the 2020 census, the population was 7,694. Its county seat is Plains. The county was created in 1876 and later organized in 1907. It is named for Henderson King Yoakum, a Texas historian. Until the passage of a liquor sales referendum held on May 11, 2013, Yoakum had been one of 19 remaining prohibition or entirely dry counties within the state of Texas.