Laurel is a city in northern Prince George's County, Anne Arundel County, and Howard County, Maryland, United States, located midway between Washington, D.C. and Baltimore. Incorporated in 1870, the city maintains a historic district including its Main Street. The population at the 2010 census was 25,115.Laurel is near Johns Hopkins University's Applied Physics Laboratory, the Fort Meade Army base, and the National Security Agency (NSA). It is also adjacent to Laurel Park Racecourse, a horse racetrack in Anne Arundel County.