Marion County IL Information


Marion County Subdivisions | Foreclosures | Preforeclosures | Bankruptcies

Marion County IL Data & Demographics (As of July 1, 2022)


Total Population 37,088 (100%)
Population in Households 36,226 (97.7%)
Population in Families 28,852 (77.8%)
Population in Group Quarters1 862 ( 2.3%)
Population Density 65
Diversity Index2 25


Median Household Income $50,548
Average Household Income $65,462
% of Income for Mortgage4 10%
Per Capita Income $27,219
Wealth Index5 52


Total HU (Housing Units) 17,221 (100%)
Owner Occupied HU 11,482 (66.7%)
Renter Occupied HU 3,920 (22.8%)
Vacant Housing Units 1,819 (10.6%)
Median Home Value $90,878
Average Home Value $117,756
Housing Affordability Index3 219


Total Households 15,402
Average Household Size 2.35
Family Households 9,930
Average Family Size 3.00
  1. Group Quarters - a place where people live or stay in a group living arrangement. Includes college residents halls, nursing facilities, military barracks, and correctional facilities.
  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 races 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.
  3. The Housing Affordability Index base is 100 and represents a balance point where a resident with a median household income can normally qualify to purchase a median price home. Values above 100 indicate increased affordability, while values below 100 indicate decreased affordability.
  4. The % of Income for Mortgage quantifies the percentage of median household income dedicated to mortgage payments on a home priced at the median value (assuming a 30-year mortgage and a 20% down payment).
  5. The Wealth Index is based on a number of indicators of affluence including average household income and average net worth, but it also includes the value of material possessions and resources. It represents the wealth of the area relative to the national level. Values above or below 100 represent above-average wealth or below-average wealth compared to the national level.


2020-2022 2022-2027
Population -0.76% -0.40%
Households -0.62% -0.30%
Families   -0.37%
Median Household Income   1.46%
Per Capita Income   2.27%
Owner Occupied HU   -0.03%


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, 2022 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
Median Household Income # 89 14th
Housing Affordability Index # 81 79th
Per Capita Income # 94 9th
Diversity Index # 55 47th

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

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