Saint Andrews is a census-designated place (CDP) located in Richland County, South Carolina, and forms part of the Columbia metropolitan area. As a CDP rather than an incorporated city, it functions as a defined statistical geographic entity within the broader Columbia region.
According to the 2010 census, Saint Andrews had a population of 20,493 residents. The community's proximity to South Carolina's state capital makes it a suburban area within the greater Columbia metropolitan statistical area.