Morris Plains, New Jersey, United States [Borough]; population was 5,219 in 1990; housing units was 1,965 in 1990; location is 40°50'N 74°29'W; land area is 2.60 square miles (1,666 acres); water area is 0.02 square miles (15 acres); FIPS code is 48210 [SourceCBP]