2 entries match your criteria.
Historical Markers in Adelphi, Maryland
Upper Marlboro is the county seat for Prince George's County
Adelphi is in Prince George's County
Prince George's County (644) ►
ADJACENT TO PRINCE GEORGE'S COUNTY
Anne Arundel County (476) ►
Calvert County (153) ►
Charles County (150) ►
Howard County (143) ►
Montgomery County (753) ►
Washington, D.C. (2615) ►
Alexandria, Virginia (378) ►
Fairfax County, Virginia (712) ►
Touch name on this list to highlight map location.
Touch blue arrow, or on map, to go there.
ADJACENT TO PRINCE GEORGE'S COUNTY
Anne Arundel County (476) ►
Calvert County (153) ►
Charles County (150) ►
Howard County (143) ►
Montgomery County (753) ►
Washington, D.C. (2615) ►
Alexandria, Virginia (378) ►
Fairfax County, Virginia (712) ►
Touch name on this list to highlight map location.
Touch blue arrow, or on map, to go there.
1 ► Maryland, Prince George's County, Adelphi — Adelphi Mill — ![]() |
On Riggs Road (Route 212) 0.8 miles south of Metzerott Road, on the right when traveling south. |
2 ► Maryland, Prince George's County, Adelphi — Mother Jones — “Grand Old Champion of Labor” — ![]() |
On Powder Mill Road (Maryland Route 212) 0.1 miles Riggs Road (Maryland Route 212). |