Barstow is a small, rural unincorporated community located at the crossroads of MD 231, German Chapel Road, and Barstow Road in Calvert County, Maryland immediately west of Prince Frederick. The community maintains its own separate zip code, 20610.
There are no residential structures and no one resides in Barstow, MD. The only building in Barstow is the Post Office. The new Calvert County Fairgrounds are located near Barstow, moving from their original location in central Prince Frederick in the late 1990s. A branch of College of Southern Maryland is very close by.
Cedar Hill and Willow Glenn were listed on the National Register of Historic Places in 1973.