Rock Island Real EstateRock Island is located in Illinois. Rock Island, Illinois has a population of 37,519. Rock Island is more family-centric than the surrounding county with 27.38% of the households containing married families with children. The county average for households married with children is 26.3%. The median household income in Rock Island, Illinois is $50,965. The median household income for the surrounding county is $58,974 compared to the national median of $69,021. The median age of people living in Rock Island is 35.4 years. Rock Island WeatherThe average high temperature in July is 84.7 degrees, with an average low temperature in January of 14.5 degrees. The average rainfall is approximately 37 inches per year, with 28.2 inches of snow per year. Rock Island MapReal estate near Rock IslandNearby CitiesNearby Cities Homes for Sale |