The city Willoughby Hills was incorporated as a village in 1954, and became a city in 1970. Since that time the city has grow to population of approximately 9,485 (2010 census). The median income for a household in the city is $47,493, and the median income for a family was $60,397. The median home value in Willoughby Hills, Oh, is $252,650. Willoughby Hills encompasses 10.8 square miles, through which the Chagrin River has carved a scenic valley to the east. The land through that valley is a flood plain, a precious natural resource.
Two notable buildings in Willoughby Hills are the Squire's Castle in the Cleveland Metroparks' North Chagrin Reservation and the Louis Penfield House, a house designed by Frank Lloyd Wright.