Marion Real EstateMarion is located in Illinois. Marion, Illinois has a population of 16,960. Marion is less family-centric than the surrounding county with 21.72% of the households containing married families with children. The county average for households married with children is 26.32%. The median household income in Marion, Illinois is $46,515. The median household income for the surrounding county is $54,682 compared to the national median of $69,021. The median age of people living in Marion is 40.5 years. Marion WeatherThe average high temperature in July is 87.6 degrees, with an average low temperature in January of 22.8 degrees. The average rainfall is approximately 46.5 inches per year, with 12 inches of snow per year. Marion MapReal estate near MarionNearby CitiesNearby Cities Homes for Sale |