Littleton Common, Massachusetts, United States [CDP]; population was 2,867 in 1990; housing units was 1,167 in 1990; location is 42°32'N 71°28'W; land area is 3.49 square miles (2,231 acres); water area is 0.16 square miles (103 acres); FIPS code is 36020 [SourceCBP]