<P> Summerville is a town in the U.S. state of South Carolina situated mostly in Dorchester County with small portions in Berkeley and Charleston counties . It is part of the Charleston - North Charleston - Summerville Metropolitan Statistical Area . The population of Summerville at the 2010 census was 43,392, and the estimated population was 50,213 as of June 1, 2018 . </P> <P> The center of Summerville is in southeastern Dorchester County; the town extends northeast into Berkeley and Charleston counties . It is bordered to the east by the town of Lincolnville and to the southeast by the city of North Charleston . The Summerville town limits extend south as far as the Ashley River next to Old Fort Dorchester State Historical Park . </P> <P> U.S. Route 78 passes near the center of Summerville, leading southeast 24 miles (39 km) to downtown Charleston and northwest 29 miles (47 km) to Interstate 95 at St. George . Interstate 26 leads through the northeast corner of Summerville with access from Exit 199, leading southeast to Charleston and northwest 90 miles (140 km) to Columbia . </P> <P> According to the United States Census Bureau, the town has a total area of 18.1 square miles (47.0 km), of which 18.0 square miles (46.7 km) is land and 0.12 square miles (0.3 km), or 0.62%, is water . </P>

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