Illinois Census & Demographic Data - July 1, 2018


Illinois Census Data

The tables below provide updated data and demographic estimates for Illinois as of July 1, 2018. 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, 2018)


Total Population 12,970,153
Population in Households 12,668,496
Population in Familes 10,271,261
Population in Group Qrtrs 301,657
Population Density2 234
Diversity Index3 64


Median Household Income $61,255
Average Household Income $87,010
Per Capita Income $33,469


Total Housing Units 5,408,158 (100%)
Owner Occupied HU 3,195,163 (59.1%)
Renter Occupied HU 1,716,218 (31.7%)
Vacant Housing Units 496,777 ( 9.2%)
Median Home Value $199,475
Average Home Value $267,162


Total Households 4,911,381
Average Household Size 2.58
Family Households 3,186,044
Average Family Size 3
  1. Demographics are point estimates for July 1st of the current year and each for the forecast years. See References for more information.
  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.


2010-2018 2018-2023
Population 0.13% 0.1%
Households 0.19% 0.12%
Families 0.01% 0.01%
Median Household Income   1.96%
Per Capita Income   2.27%