South Duxbury, Massachusetts, United States [CDP]; population was 3,017 in 1990; housing units was 1,272 in 1990; location is 42°1'N 70°41'W; land area is 2.96 square miles (1,893 acres); water area is 1.46 square miles (933 acres); FIPS code is 63690 [SourceCBP]