Limestone County is a county in the U.S. state of Texas. As of the 2020 census, its population was 22,146. Its county seat is Groesbeck. The county was created in 1846.

Groesbeck is a city in and the county seat of Limestone County, Texas, United States. Its population was 3,631 at the 2020 census. The community is named after a railroad employee.