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For the Census Designated area in Montgomery County formerly known as Mechanicsville see Olney, MarylandMechanicsville 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.

Oraville is an unincorporated community in St. Mary's County, Maryland, United States. Oraville is located at the intersection of Maryland routes 6 and 235, 6.3 miles (10.1 km) southeast of Charlotte Hall.The name Oraville is believed to be named after a girl named Ora Hopkins. Her stepfather, Nicholas S Hopkins, ran a millinery store in the early 1900s which was also a post office on the corner of Morganza Turner Rd and Route 235.