Illinois Census & Demographic Data - July 1, 2020


Illinois Census Data

The tables below provide updated data and demographic estimates for Illinois as of July 1, 2020. Our Illinois Census Data Comparison Tool allows you to compare and rank IL cities, towns, ZIP Codes and Counties.

Illinois Data & Demographics (As of July 1, 2020)


Total Population 12,862,980 (100%)
Population in Households 12,565,162 (97.7%)
Population in Families 10,121,406 (78.7%)
Population in Group Quarters1 297,818 ( 2.3%)
Population Density 232
Diversity Index2 65


Median Household Income $65,003
Average Household Income $93,667
% of Income for Mortgage4 13%
Per Capita Income $35,782
Wealth Index5 105


Total HU (Housing Units) 5,400,681 (100%)
Owner Occupied HU 3,213,433 (59.5%)
Renter Occupied HU 1,687,139 (31.2%)
Vacant Housing Units 500,109 ( 9.3%)
Median Home Value $207,550
Average Home Value $271,110
Housing Affordability Index3 138


Total Households 4,900,572
Average Household Size 2.56
Family Households 3,172,306
Average Family Size 3
  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.


2010-2020 2020-2025
Population 0.02% -0.1%
Households 0.13% -0.05%
Families -0.03% -0.15%
Median Household Income   1.51%
Per Capita Income   2.0%
Owner Occupied HU   0.0%