On July 29, 1925, an Order of the Arrow charter was granted to Unalachtico Lodge of the Del-Mar-Va Council. The lodge totem was the turkey. By the late 1930s, the lodge had become inactive and was disbanded.

Through the efforts of the Delmont Lodge #43 of the Valley Forge Council, Lodge #20 was reorganized on June 22, 1957. The new name chosen by the membership was Nentego, a derivation of the name of one of the major Delaware Tribes, which means, "People from across the water." Delmont Lodge inducted two youth from each district and the council professional staff to provide the initial core of Nentego Lodge. The Lodge totem is the Rockfish, which can be found in the Chesapeake Bay. The lodge colors are blue, for the water of the Chesapeake, and grey, for the Rockfish.