Marion County IL Information


Marion County Subdivisions

Marion County IL Data & Demographics (As of July 1, 2018)


Total Population 38,517
Population in Households 37,759
Population in Familes 30,450
Population in Group Qrtrs 758
Population Density1 67
Diversity Index2 19


Median Household Income $45,648
Average Household Income $59,290
Per Capita Income $24,754


Total Housing Units 18,296 (100%)
Owner Occupied HU 11,886 (65.0%)
Renter Occupied HU 4,060 (22.2%)
Vacant Housing Units 2,350 (12.8%)
Median Home Value $81,157
Average Home Value $110,592


Total Households 15,946
Average Household Size 2.37
Family Households 10,460
Average Family Size 3
  1. Population Density = Total Population per square mile.
  2. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.


2010-2017 2017-2022
Population -0.29% -0.39%
Households -0.15% -0.3%
Families -0.33% -0.41%
Median Household Income   3.33%
Per Capita Income   3.4%


Marion County IL - Peer Comparisons by Rank and Percentile

The table below compares Marion County to the other 102 counties and county equivalents in Illinois by rank and percentile using July 1, 2018 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 36 66th
Population Density # 37 65th
Diversity Index # 55 46th
Median Household Income # 80 23rd
Per Capita Income # 77 25th

Additional comparisons and rankings can be made with a VERY EASY TO USE Illinois Census Data Comparison Tool.