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 3,594 as of July 1, 2017.

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, 2017.

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City of Johnston City, IL Boundary Map

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


Total Population 3,594
Daytime Population: Workers 750
Daytime Population: Residents 2,166
Total Daytime Population (TDP) 2,916
Ratio TDP/Total Population1 0.81
Population in Households 3,587
Population in Familes 2,812
Population in Group Qrtrs 7
Population Density2 1,722
Diversity Index3 9


Median Household Income $37,500
Average Household Income $46,821
Per Capita Income $20,042


Total Housing Units 1,727 (100%)
Owner Occupied HU 1,088 (63.0%)
Renter Occupied HU 442 (25.6%)
Vacant Housing Units 198 (11.5%)
Median Home Value $65,721
Average Home Value $65,441


Total Households 1,529
Average Household Size 2.35
Family Households 979
Average Family Size 3
  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 0.16% 0.21%
Households 0.16% 0.23%
Families 0.07% 0.12%
Median Household Income   -0.01%
Per Capita Income   2.11%

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, 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 # 404 71st
Population Density # 378 72nd
Diversity Index # 940 32nd
Median Household Income # 1265 8th
Per Capita Income # 1262 8th

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

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