Lockhart is a city in Caldwell County, Texas, United States. It is the county seat of Caldwell County. In the 2000 census the population of Lockhart was 11,615. As of 2007 the estimated population was 12,013. The city of Lockhart is named after Byrd Lockhart, an assistant surveyor of Geen Dewit and reportedly the first Anglo to set foot in Caldwell County. Byrd Lockhart is survived by James H. Lockhart and his family, who currently reside in Dallas. Lockhart was the site of a victory of the Texans over the Comanche, at the Battle of Plum Creek in 1840. The Texas Legislature proclaimed Lockhart as The Barbecue Capital of Texas. Lockhart has four major barbecue restaurants. The local style of barbecue cooking does not use barbecue sauce. The 1996 Christopher Guest comedy film Waiting for Guffman was filmed partly in Lockhart, including the historic courthouse square. Lockhart's Dr. Eugene Clark Library is the oldest operating public library in Texas. Lockhart was originally called Plum Creek but the name was later changed to Lockhart. Lockhart and the county of Caldwell County is within the Lockhart-San Marcos Micropolitan Stastistical Area.