Brimfield (formerly Charleston) is a village in Peoria County, Illinois, United States.
The population was 868 at the 2010 census. Brimfield is part of the Peoria, Illinois Metropolitan Statistical Area.
Brimfield is located at 40°50′18″N 89°53′2″W (40.838210, -89.883999).
According to the 2010 census, Brimfield has a total area of 0.785 square miles (2.03 km2), of which 0.78 square miles (2.02 km2) (or 99.36%) is land and 0.005 square miles (0.01 km2) (or 0.64%) is water.
As of the census of 2000, there were 933 people, 362 households, and 245 families residing in the village. The population density was 1,238.7 people per square mile (480.3/km2). There were 369 housing units at an average density of 489.9 per square mile (190.0/km2). The racial makeup of the village was 98.50% White, 0.32% Native American, 0.21% from other races, and 0.96% from two or more races. Hispanic or Latino of any race were 0.75% of the population.
There were 362 households, out of which 37.0% had children under the age of 18 living with them, 55.2% were married couples living together, 10.2% had a female householder with no husband present, and 32.3% were non-families. 27.1% of all households were made up of individuals, and 11.9% had someone living alone who was 65 years of age or older.