Joliet, IL Profile: Facts, Map & Data


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Joliet, Illinois - Basic Facts

The City of Joliet is the 4th largest city in Illinois with a population of 149,300 as of July 1, 2016. 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, 2016.

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, 2016)


Total Population 149,300
Population in Households 146,690
Population in Familes 125,156
Population in Group Qrtrs 2,610
Population Density1 2,381
Diversity Index2 74


Total Households 48,333
Average Household Size 3.03
Family Households 34,733
Average Family Size 4


Total Housing Units 52,339 (100%)
Owner Occupied HU 34,227 (65.4%)
Renter Occupied HU 14,106 (27.0%)
Vacant Housing Units 4,006 ( 7.7%)
Median Home Value $177,396
Average Home Value $192,415


Median Household Income $60,722
Average Household Income $73,879
Per Capita Income $24,635
  (Compound Annual Growth Rates)


2010-2015 2015-2020
Population 0.2% 0.23%
Households 0.1% 0.16%
Families -0.08% 0.07%
Median Household Income   1.67%
Per Capita Income   1.44%
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.

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, 2016 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 # 4 100th
Population Density1 # 201 85th
Diversity Index2 # 47 97th
Median Household Income # 379 72nd
Per Capita Income # 795 42nd

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

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