Sanger is a city in Denton County, Texas, United States. As of the 2020 census, the population of the city was 8,839. Sanger is located at 33°…Sanger is a city in Denton County, Texas, United States. As of the 2020 census, the population of the city was 8,839. Sanger is located at 33°21′47″N 97°10′34″W / 33.36306°N 97.17611°W. According to the United States Census Bureau, the city has a total area of 10.9 square miles, of which 0.04 square miles, or 0.45%, is covered by water.