Scotch Plains, New Jersey, United States [CDP]; population was 21,160 in 1990; housing units was 7,792 in 1990; location is 40°38'N 74°22'W; land area is 9.07 square miles (5,807 acres); water area is 0.01 square miles (9 acres); FIPS code is 66090 [SourceCBP]