Maria Furnace is a South Mountain populated place on Toms Creek west of Fairfield, Pennsylvania, that was the location of an 1822 blast furnace until operations were moved to Caledonia. The remains of the original blast furnace ("Maria Furnace") are located at coordinates: 39|46|30.64 N, 77|24|25.98 W. The remains consist of a pile of rocks in a small wooded area overgrown with vegetation. References 1822 establishments in Pennsylvania Populated places established in 1822 Unincorporated communities in Adams County, Pennsylvania Unincorporated communities in Pennsylvania