Swansea is a town in Lexington County, South Carolina, United States.

It is part of the Columbia, South Carolina Metropolitan Statistical Area.

As of the 2020 United States census, there were 722 people, 370 households, and 236 families residing in the town.

As of the census[4] of 2000, there were 533 people, 224 households, and 154 families residing in the town.

29.5% of all households were made up of individuals, and 11.2% had someone living alone who was 65 years of age or older.