Charlestown is a town in Cecil County, Maryland, United States.

Charlestown is the location of Charlestown Historic District and Indian Queen Tavern and Black's Store, both listed on the National Register of Historic Places in 1975.

Maryland Route 7 is the most prominent highway serving Charlestown, following Old Philadelphia Road along the north edge of town.

Maryland Route 267 also serves Charlestown, passing through the center of town on an old alignment of MD 7.

23.3% of all households were made up of individuals, and 7.9% had someone living alone who was 65 years of age or older.

In 2000, 26.7% of Charlestown residents identified as being of Irish American heritage.

This was the highest percentage of Irish Americans of any place in Maryland.

17.6% of all households were made up of individuals, and 7.3% had someone living alone who was 65 years of age or older.