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is a census-designated place (CDP) in Anne Arundel County, Maryland, United States. The population was 35,076 at the 2000 census, which is a 30 percent increase over the 24,499 population of 1990.. The zipcode is 21144.
According to the United States Census Bureau, the CDP has a total area of 14.0 square miles (36.2 km²), all of it land.
The town originally was zoned rural resident and commercial. Most of the farms in Severn have recently been rezoned residential. There are no major retail sales outlets in Severn. Shopping is done in nearby larger towns. One of the largest malls in Maryland, Arundel Mills Mall, is located just four miles away, allowing for convenient shopping for Severn residents. A few U.S. government facilities, such as the National Security Agency and Fort Meade, are located on the edge of Severn.