Illinois City 61259 Real EstateIllinois City is located in Illinois. Illinois City, Illinois 61259has a population of 1,212. Illinois City 61259 is less family-centric than the surrounding county with 24.77% of the households containing married families with children. The county average for households married with children is 25.55%. The median household income in Illinois City, Illinois 61259 is $67,656. The median household income for the surrounding county is $51,426 compared to the national median of $57,652. The median age of people living in Illinois City 61259 is 41.1 years. Illinois City WeatherThe average high temperature in July is 86.2 degrees, with an average low temperature in January of 15.3 degrees. The average rainfall is approximately 37 inches per year, with 24.3 inches of snow per year. Illinois City MapReal estate near Illinois CityNearby CitiesNearby Cities Homes for Sale |