Fairfield is located in Illinois. Fairfield, Illinois has a population of 4,159. Fairfield is less family-centric than the surrounding county with 23% households with children. The county percentage for households with children is 26%.
The median household income in Fairfield, Illinois is $41,735. The median household income for the surrounding county is $51,811 compared to the national median of $66,222. The median age of people living in Fairfield is 42.5 years.
The average high temperature in July is 88.2 degrees, with an average low temperature in January of 19.7 degrees. The annual precipitation is 45.