Summerfield is a village in St. Clair County, Illinois, United States.

[4] As of the census[6] of 2010, there were 451 people, 161 households, and 123 families residing in the village.

There were 180 housing units at an average density of 428.1 per square mile (165.3/km2).

There were 161 households, out of which 36.0% had children under the age of 18 living with them, 60.2% were married couples living together, 11.8% had a female householder with no husband present, and 23.6% were non-families.

17.4% of all households were made up of individuals, and 6.8% had someone living alone who was 65 years of age or older.