East Harwich, Massachusetts, United States [CDP]; population was 3,828 in 1990; housing units was 2,386 in 1990; location is 41°42'N 70°2'W; land area is 8.25 square miles (5,282 acres); water area is 0.70 square miles (450 acres); FIPS code is 19400 [SourceCBP]