Johnston City, IL Profile: Facts, Map & Data


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Johnston City, Illinois - Basic Facts

The City of Johnston City had a population of 3,626 as of July 1, 2016.

The primary coordinate point for Johnston City is located at latitude 37.8206 and longitude -88.9284 in Williamson County. The formal boundaries for the City of Johnston City (see map below) encompass a land area of 2.09 sq. miles and a water area of 0.06 sq. miles. Williamson County is in the Central time zone (GMT -6). The elevation is 433 feet.

The City of Johnston City (GNIS ID: 2395475) 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 Johnston City is located within Herrin Election Precinct, a minor civil division (MCD) of Williamson County.

Beneath the boundary map are tables with Johnston City population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2016.

Neighborhood Data

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City of Johnston City, IL Boundary Map

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Boundary Maps: Herrin Election Precinct | Williamson County | Illinois Counties

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Johnston City, IL Data & Demographics (As of July 1, 2016)


Total Population 3,626
Population in Households 3,619
Population in Familes 2,839
Population in Group Qrtrs 7
Population Density1 1,737
Diversity Index2 8


Total Households 1,545
Average Household Size 2.34
Family Households 990
Average Family Size 3


Total Housing Units 1,741 (100%)
Owner Occupied HU 1,105 (63.5%)
Renter Occupied HU 439 (25.2%)
Vacant Housing Units 196 (11.3%)
Median Home Value $61,190
Average Home Value $61,844


Median Household Income $37,325
Average Household Income $45,377
Per Capita Income $19,441
  (Compound Annual Growth Rates)


2010-2015 2015-2020
Population 0.33% 0.29%
Households 0.36% 0.31%
Families 0.26% 0.22%
Median Household Income   -1.17%
Per Capita Income   0.51%
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.

Johnston City, IL - Peer Comparisons by Rank and Percentile

The table below compares Johnston City 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 # 402 71st
Population Density1 # 379 72nd
Diversity Index2 # 979 28th
Median Household Income # 1219 11th
Per Capita Income # 1247 9th

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

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