Willoughby Hills, Ohio, United States [City]; population was 8,427 in 1990; housing units was 4,235 in 1990; location is 41°35'N 81°26'W; land area is 10.76 square miles (6,890 acres); water area is 0.09 square miles (55 acres); FIPS code is 85512 [SourceCBP]