Chapin, popularly known as the "Capital of Lake Murray", is a small lake town located at the northern tip of Lexington County, South Carolina, United States. Lake Murray separates Chapin from the rest of Lexington County. The population of Chapin was 1,445 according to the 2010 census, and an estimated 1,633 in 2019. Chapin is located approximately 24 miles northwest of Columbia, and many people commute there for work; however, the town is considered fringe rural by the US postal service.