Wallingford Center, Connecticut, United States [CDP]; population was 17,827 in 1990; housing units was 7,716 in 1990; location is 41°27'N 72°49'W; land area is 7.17 square miles (4,586 acres); water area is 0.12 square miles (79 acres); FIPS code is 78880 [SourceCBP]