Fort Lupton, Colorado, United States [City]; population was 5,159 in 1990; housing units was 1,795 in 1990; location is 40°5'N 104°48'W; land area is 2.90 square miles (1,856 acres); water area is 0.04 square miles (24 acres); FIPS code is 27700 [SourceCBP]