Joliet, IL Profile: Facts, Map & Data


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Joliet, Illinois - Basic Facts

The City of Joliet is the 3rd largest city in Illinois with a population of 150,572 as of July 1, 2017. Joliet ranks in the upper quartile for Population Density and Diversity Index when compared to the other cities, towns and Census Designated Places (CDPs) in Illinois. See peer rankings below.

The primary coordinate point for Joliet is located at latitude 41.5181 and longitude -88.1584 in Will County. The formal boundaries for the City of Joliet (see map below) encompass a land area of 62.71 sq. miles and a water area of 0.66 sq. miles. Will County is in the Central time zone (GMT -6). The elevation is 541 feet.

While the primary coordinates for City of Joliet are located in Will County, it should be noted that the formal boundaries for this community also extend into and Kendall County.

The City of Joliet (GNIS ID: 2395477) has a C1 Census Class Code which indicates an active incorporated place that does not serve as a county subdivision equivalent. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.

The City of Joliet is located within Township of Troy, a minor civil division (MCD) of Will County.

Beneath the boundary map are tables with Joliet population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2017.

Alternate Unofficial Names for Joliet: Juliet.

Neighborhood Data

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City of Joliet, IL Boundary Map

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Boundary Maps: Township of Troy | Will County | Illinois Counties

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Joliet, IL Data & Demographics (As of July 1, 2017)


Total Population 150,572
Daytime Population: Workers 61,457
Daytime Population: Residents 78,781
Total Daytime Population (TDP) 140,238
Ratio TDP/Total Population1 0.93
Population in Households 147,789
Population in Familes 126,092
Population in Group Qrtrs 2,783
Population Density2 2,401
Diversity Index3 74


Median Household Income $62,927
Average Household Income $76,798
Per Capita Income $25,646


Total Housing Units 52,699 (100%)
Owner Occupied HU 34,462 (65.4%)
Renter Occupied HU 14,335 (27.2%)
Vacant Housing Units 3,903 ( 7.4%)
Median Home Value $181,204
Average Home Value $195,799


Total Households 48,796
Average Household Size 3.03
Family Households 35,030
Average Family Size 4
  1. If the ratio of the TDP to Total Population is greater than 1, the location gains population during the day when commuting workers are present. If the ratio is less than 1, the location is more of a bedroom community where people commute to another place for work.
  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.


2010-2017 2017-2022
Population 0.29% 0.37%
Households 0.22% 0.33%
Families 0.05% 0.24%
Median Household Income   1.95%
Per Capita Income   2.32%

Joliet, IL - Peer Comparisons by Rank and Percentile

The table below compares Joliet to the other 1,368 incorporated cities, towns and CDPs in Illinois by rank and percentile using July 1, 2017 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 # 3 100th
Population Density # 191 86th
Diversity Index # 46 97th
Median Household Income # 357 74th
Per Capita Income # 789 42nd

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

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