to the south, forming the southern edge of the CDP. US 340 leads northeast to Frederick, the county seat, and southwest to Harpers Ferry, West Virginia. According to the U.S. Census Bureau, the Jefferson CDP has an area of , all land. Mar-Lu-Ridge Summer Camp and Education and Conference Center, located on the crest of Catoctin Mountain, south of Jefferson, has been a main retreat and outdoor ministry site for the Evangelical Lutheran Church in America since 1959. Demographics References External links Jefferson community website Census-designated places in Frederick County, Maryland Census-designated places in Maryland Populated places established in 1774 1774 establishments in Maryland