Dumfries (DUHM-freez), town (1990 pop. 4,282), Prince William co., NE Va., near Potomac R., 15 mi/24 km SE of Manassas; 38°34'N 77°19'W. Mfg. (concrete, consumer prods.); agr. (grain, soybeans; livestock; dairying). Prince William Forest Park to W; Leesylvania State Park to NE. Quantico Marine Corps Base, Quantico Natl. Veterans Cemetery to SW; Chopawamsic Recreation Area to S.
