Marion County IL Information


Marion County Subdivisions

Marion County IL Data & Demographics (As of July 1, 2017)


Total Population 38,654
Daytime Population: Workers 16,560
Daytime Population: Residents 21,312
Total Daytime Population (TDP) 37,872
Ratio TDP/Total Population1 0.98
Population in Households 37,896
Population in Familes 30,453
Population in Group Qrtrs 758
Population Density2 68
Diversity Index3 18


Median Household Income $42,787
Average Household Income $56,629
Per Capita Income $23,561


Total Housing Units 18,467 (100%)
Owner Occupied HU 11,420 (61.8%)
Renter Occupied HU 4,521 (24.5%)
Vacant Housing Units 2,526 (13.7%)
Median Home Value $78,534
Average Home Value $102,885


Total Households 15,941
Average Household Size 2.38
Family Households 10,482
Average Family Size 3
  1. If the ratio of the TDP to Total Population is greater than 1, the location gains population during the day when commuting workers are present. If the ratio is less than 1, the location is more of a bedroom community where people commute to another place for work.
  2. Population Density = Total Population per square mile.
  3. 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 -0.28% -0.37%
Households -0.18% -0.31%
Families -0.34% -0.43%
Median Household Income   1.79%
Per Capita Income   2.88%


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, 2017 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 # 37 65th
Population Density # 37 65th
Diversity Index # 56 46th
Median Household Income # 88 15th
Per Capita Income # 83 20th

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