For the Census Designated area in Montgomery County formerly known as Mechanicsville see Olney, Maryland
Mechanicsville is an unincorporated community in St. Mary's County, Maryland. 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 235. This community is served by the St. Mary's County Public Schools including Chopticon High School.