Severn is a census-designated place (CDP) in Anne Arundel County, Maryland, United States. The population was 44,231 at the 2010 census, a 26% increase from its population of 35,076 in 2000. The zip code is 21144.
Severn is located at 39°7′58″N 76°41′38″W (39.132841, −76.694002) in northwestern Anne Arundel County. It is bordered by Hanover to the north, Glen Burnie to the east, Odenton and Millersville to the south, and Fort George G. Meade to the west. The Baltimore–Washington Parkway (Maryland Route 295) forms the northwestern edge of the CDP, Maryland Route 176 (Dorsey Road) forms the northern edge, and Interstate 97 forms the eastern edge. Part of the southern boundary of the CDP is formed by the non-tidal portion of the Severn River. The Maryland Route 100 freeway runs through the northern part of the CDP, connecting the B-W Parkway and I-97.
According to the United States Census Bureau, the CDP has a total area of 17.7 square miles (45.9 km2), all of it land.
At the 2000 census there were 35,076 people, 12,003 households, and 9,506 families living in the CDP. The population density was 2,511.3 people per square mile (969.4/km2). There were 12,362 housing units at an average density of 885.1 per square mile (341.7/km2).