Johnson County is a county located in the U.S. state of Texas. As of the 2020 census, its population was 179,927. Its county seat is Cleburne. Johnson County is named for Colonel Middleton Tate Johnson Sr., a Texas Ranger, politician and soldier in the Mexican-American War and the American Civil War. Johnson County is included in the Dallas–Fort Worth–Arlington metropolitan statistical area.

Cleburne is a city in and the county seat of Johnson County, Texas, United States. As of the 2020 census, its population was 31,352. The city is named in honor of Patrick Cleburne, a Confederate general. Lake Pat Cleburne, the reservoir that provides water to the city and surrounding area, is also named after him.