Old Tappan, New Jersey, United States [Borough]; population was 4,254 in 1990; housing units was 1,355 in 1990; location is 41°1'N 73°59'W; land area is 3.23 square miles (2,068 acres); water area is 0.85 square miles (541 acres); FIPS code is 54870 [SourceCBP]