Luling is a city in Caldwell and Guadalupe counties, Texas, United States, along the San Marcos River. The population as of the 2020 census w…Luling is a city in Caldwell and Guadalupe counties, Texas, United States, along the San Marcos River. The population as of the 2020 census was 5,599. The town was named after a New York banker, Charles Luling. He was a personal friend of Thomas Wentworth Pierce and provided the financing for the railroad as well the purchase of the land that became Luling. Prior to the founding of the town, a small farming community named Atlanta was established nearby, with residents associating themselves with the newly founded Luling, causing Atlanta to fade.