Mount Pleasant is a large suburban town in Charleston County, South Carolina, United States. It is the fourth-largest municipality in South Carolina, and for several years it was one of the state's fastest-growing areas, doubling in population between 1990 and 2000. The population was 67,843 at the 2010 census, and the estimated population in 2014 was 77,796. It is the third-largest municipality in the Charleston – North Charleston – Summerville metropolitan area, behind Charleston and North Charleston.