Mechanicsville is an unincorporated community and census-designated place in St. Mary's County, Maryland, United States. It is adjacent to the community of Charlotte Hall, which is known for its agriculture, Amish population, large farmers' market/flea market, and the Maryland Veterans Home. Mechanicsville has many small businesses and restaurants along Maryland Route 5 and Maryland Route 235. This community is served by the St. Mary's County Public Schools, including Chopticon High School. As of the 2010 Census, Mechanicsville had a population of 1,508 people.
The Amish community in the Mechanicsville area consists of eight church districts and approximately 1,000 people. The Amish first came to the area in 1940 after some members left the Amish community in Lancaster County, Pennsylvania over a conflict with schooling. The Amish in St. Mary's County maintain dairy and produce farms along with small Amish businesses.