Soon after Karnes County was created and organized in 1854, a frame and clapboard courthouse was erected at this site in the center of Jefferson Square. This rock structure was built in 1873 to replace the first courthouse and adjacent county clerk's office, which had been destroyed by a storm and fire following the Civil War (1861-65). After county seat was moved to Karnes City in 1894, building was used as a school until 1945.