Ballinger (/'bæl?nd??r/ BAL-in-jur) is a city in Runnels County, Texas, United States. The population was 3,767 at the 2010 census. It is the county seat of Runnels County. Ballinger is located at 31°44'N 99°57'W? / ?31.733°N 99.950°W? / 31.733; -99.950 (31.7409, -99.9538). According to the United States Census Bureau, the city has a total area of 3.4 square miles (8.7 km2), of which 0.0019 square miles (0.005 km2), or 0.06%, is water.