Wellesley, Massachusetts, United States [CDP]; population was 26,615 in 1990; housing units was 8,764 in 1990; location is 42°18'N 71°17'W; land area is 10.18 square miles (6,515 acres); water area is 0.31 square miles (198 acres); FIPS code is 74210 [SourceCBP]