Adamstown is an unincorporated community located in Frederick County, Maryland, USA. It is named for Adam Kohlenberg (March 11, 1819 - January 1, 1868), a station agent and first town merchant who owned much of present-day Adamstown.
The largest area-wide event is the Carroll Manor Fire Company Carnival which occurs every June.
Adamstown lies in the fertile valley between Sugarloaf and Catoctin Mountain on Carrollton Manor, a 17,000-acre (69 km2) estate originally owned by Charles Carroll of Carrollton. Until 2000, it was a little-altered representative of mid-19th century linear town planning. It is significant in architecture for its variety of structures, including residential, commercial, industrial, educational, agricultural, and religious buildings. The late 18th century road from Jefferson to Greenfield Mills on the Monocacy River, originally called the Bridal Road, followed the route of the present-day Mountville Road. The 1832 arrival of the railroad to the Manor created the economic and transportation impetus for the development of the community.