Irmo is a town in Lexington and Richland counties, South Carolina. and a relatively affluent suburb of Columbia. It is part of the Columbia Metropolitan Statistical Area and is located 12 miles (19 km) northwest of the city center. The population of Irmo was 11,097 at the 2010 census.
Irmo was chartered on Christmas Eve in 1890 in response to the opening of the Columbia, Newberry and Laurens Railroad. The name of Irmo was the result of combining the names of Captain C.J. Iredell and Henry Moseley, two important figures in the founding of the town. Despite the town's growth, Irmo does not have an actual downtown area. Rather, it consists of several clusters of suburban neighborhoods. Columbiana Centre mall was built in 1990, which led to the growth of the Harbison area.