Colchester Real EstateColchester is located in Illinois. Colchester, Illinois has a population of 1,314. Colchester is less family-centric than the surrounding county with 15.64% of the households containing married families with children. The county average for households married with children is 26.67%. The median household income in Colchester, Illinois is $49,063. The median household income for the surrounding county is $45,704 compared to the national median of $69,021. The median age of people living in Colchester is 44.7 years. Colchester WeatherThe average high temperature in July is 86.9 degrees, with an average low temperature in January of 15.3 degrees. The average rainfall is approximately 39.2 inches per year, with 20.3 inches of snow per year. Colchester MapReal estate near ColchesterNearby CitiesNearby Cities Homes for Sale |