Sour Lake is a city in Hardin County, Texas, United States. The population was 1,667 at the 2000 census. It was originally named Sour Lake Springs, after the mineral-laden spring water that flowed into the nearby lake. Sour Lake apartments for rent comparison page shows most up to date rent information on Sour Lake apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.