Adamstown is an unincorporated community and census-designated place (CDP) in Frederick County, Maryland, United States. It is named for Adam Kohlenberg, a station agent and first town merchant who owned much of present-day Adamstown. As of the 2010 census, the Adamstown CDP had a population of 2,372.

Carrollton Manor was a 17,000 acre (69 km2) tract of land in Frederick County, Maryland, United States, which extended from the Potomac River on the south, Catoctin Mountain to the west, the Monocacy River to the east, and Ballenger Creek to the north. It included the towns of Lime Kiln, Buckeystown, Adamstown, Doubs, Licksville, Tuscarora, and Point of Rocks.