Thurmont is a town in Freerick County, Maryland, United States. The population was 5,588 at the 2000 census. The town is located in the northern part of Frederick County (north of Frederick, Maryland, the county seat), approximately ten miles from the Pennsylvania border, along U.S. Highway 15. It is home to Cunningham Falls State Park and Catoctin Mountain Park, which contains the presidential retreat of Camp David. The town's slogan is "Gateway to the Mountains." Signs in the area also express the slogan "It's Cozy in Thurmont."