[1] It is located southwest of the Gettysburg Battlefield, at Marsh Creek along the Emmitsburg Road (U.S. Route 15 Business),[citation needed] in Cumberland Township.

[4] Neighboring communities are Fairfield (west), Gettysburg (north), Round Top (northeast), Barlow (east), Harney, Maryland (southeast), and Fairplay (south).

[9] Upstream of the community and west of the former post office is the 1894 Cunningham Bridge on the National Register of Historic Places (closed c. 1997 and planned for demolition).

Greenmount hosted the Pennsylvania welcome ceremony for the 1919 Motor Transport Corps convoy, which cooked lunch at McCurdy's Schoolhouse to the north.

[16] The 1934 Greenmount Fire Company was organized at Marsh Creek Heights in Mrs Harvey Miller's stand,[17][18][19][20] in 1939 the "Greenmount basketeers" lost to Gettysburg on the "CCC floor"[21] (the CCC camp was at McMillan Woods), and in June 1949, a new baseball field with grandstand was built at Marsh Creek Heights.