Chicago, Illinois - Basic Facts

Chicago is the common name for the community and surrounding area while the formal official name is the City of Chicago.

It is an incorporated place (Class Code P1) located in Cook County at latitude 41.85 and longitude -87.6501. Cook County is in the Central time zone (GMT -6). The elevation is 587 feet.

The formal boundaries for the City of Chicago (see map) encompass a land area of 227.77 sq. miles and a water area of 6.37 sq. miles.

Alternate Unofficial Names for Chicago: Chicagu, Cikago, The Windy City.

Camera Icon Photos of the local Chicago, IL area

Also See: Chicago, IL ZIP Codes and ZIP Code Maps

Chicago, IL Data & Demographics (As of July 1, 2014)


Total Population 2,734,512
Population in Households 2,674,219
Population in Familes 1,974,753
Population in Group Qrtrs 60,293
Population Density1 12,013
Diversity Index2 82


Total Households 1,067,453
Average Household Size 2.51
Family Households 583,267
Average Family Size 3


Total Housing Units 1,214,149 (100%)
Owner Occupied HU 453,465 (37.3%)
Renter Occupied HU 613,988 (50.6%)
Vacant Housing Units 146,696 (12.1%)
Median Home Value $233,952
Average Home Value $292,092


Median Household Income $44,353
Average Household Income $66,309
Per Capita Income $26,196
  (Compound Annual Growth Rates)


Population 0.34% 0.34%
Households 0.49% 0.46%
Families 0.26% 0.31%
Median Household Income   3.19%
Per Capita Income   3.39%
1) Population Density = Total Population per square mile.
2) The Diversity Index is a scale of 0 to 100 that represents the likelyhood 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.
Based on Census 2010 counts, the Diversity Index for the United States was 60.6 and it is expected to increase to 64.8 by July 1, 2018.

Chicago, IL - Peer Comparisons by Rank and Percentile

The table below compares Chicago to the other 1,367 incorporated cities, towns and CDPs in Illinois by rank and percentile using July 1, 2014 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 DescriptionRankPercentile
Total Population # 1 100th
Population Density1 # 5 100th
Diversity Index2 # 9 99th
Median Household Income # 986 28th
Per Capita Income # 541 60th

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