Cook County IL Information


Cook County Subdivisions

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


Total Population 5,274,129
Population in Households 5,183,187
Population in Familes 4,087,547
Population in Group Qrtrs 90,942
Population Density1 5,579
Diversity Index2 78


Median Household Income $59,718
Average Household Income $88,254
Per Capita Income $34,083


Total Housing Units 2,230,295 (100%)
Owner Occupied HU 1,108,536 (49.7%)
Renter Occupied HU 898,740 (40.3%)
Vacant Housing Units 223,019 ( 10.0%)
Median Home Value $256,912
Average Home Value $335,311


Total Households 2,007,276
Average Household Size 2.58
Family Households 1,216,270
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 0.18% 0.12%
Households 0.25% 0.16%
Families 0.05% 0.02%
Median Household Income   1.91%
Per Capita Income   2.28%


Cook County IL - Peer Comparisons by Rank and Percentile

The table below compares Cook 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 # 1 100th
Population Density # 1 100th
Diversity Index # 1 100th
Median Household Income # 15 86th
Per Capita Income # 7 94th

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