Crownsville is a census-designated place (CDP) in Anne Arundel County, Maryland, United States. The population was 1,757 at the 2010 census. It hosts the Anne Arundel County Fair each September, as well as the annual Maryland Renaissance Festival for several summer weekends. A state psychiatric hospital was formerly in Crownsville. The area offers waterfront scenery and easy access to urban metropolitan areas and culture.
Crownsville is located at 39°1′27″N 76°35′54″W (39.024149, −76.598295), 7 miles (11 km) northwest of Annapolis, the state capital. Maryland Route 178 (Generals Highway) runs through the center of the CDP, and Interstate 97 forms the southwestern edge of the CDP, with access from the north via Exit 5.
According to the United States Census Bureau, the CDP has a total area of 5.1 square miles (13.2 km2), all land. However, waterfront communities such as Arden On The Severn and Herald Harbor have Crownsville addresses.
As of the census of 2000, there were 1,670 people, 485 households, and 392 families residing in the CDP. The population density was 300.7 people per square mile (116.2/km²).