Luling /ꜛlu̟ː.liŋ/ is a city in Caldwell and Guadalupe counties, Texas, United States, along the San Marcos River. The population, as of the 2010 census, is 5,411. The town of Luling 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. (Reference>Caldwell County, Texas deeds.