Charlotte Hall is a census-designated place (CDP) in Charles County and St. Mary's County, Maryland, United States. The population was 1,420 at the 2010 census. The Maryland Veterans Home for disabled veterans, including a U.S. Veterans Affairs clinic, is located on the site of the former Charlotte Hall Military Academy. The Academy site was declared the Charlotte Hall Historic District, and listed on the National Register of Historic Places in 1975. Since 1940, a sizable Amish farming community has existed nearby along with a farmers market and large flea market complex on busy Maryland Route 5, which is also the site of numerous strip-mall businesses continuing into the adjacent community of Mechanicsville.