Willow Hill is a village in Jasper County, Illinois. The population was 250 at the 2000 census.Willow Hill is located at 38°59′50″N 88°1′17″W / 38.99722°N 88.02139°W / 38.99722; -88.02139.According to the 2010 census, Willow Hill has a total area of 1.04 square miles, all land.As of the census of 2000, there were 250 people, 82 households, and 65 families residing in the village. The population density was 240.9 people per square mile. There were 90 housing units at an average density of 86.7 per square mile. The racial makeup of the village was 96.40% White, 3.20% Asian, and 0.40% from two or more races.There were 82 households out of which 42.7% had children under the age of 18 living with them, 70.7% were married couples living together, 3.7% had a female householder with no husband present, and 20.7% were non-families. 17.1% of all households were made up of individuals and 8.5% had someone living alone who was 65 years of age or older. The average household size was 3.