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Johnston City, IL Profile: Facts & Data

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Johnston City, Illinois - Basic Facts

The City of Johnston City had a population of 3,220 as of July 1, 2025.

The primary coordinate point for Johnston City is located at latitude 37.8206 and longitude -88.9276 in Williamson County. The formal boundaries for the City of Johnston City 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 City of Johnston City 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 Lake Creek Election Precinct, a minor civil division (MCD) of Williamson County.


Jump to... (On This Page!)
  1. Johnston City 2025 Demographic Data
  2. Growth Rates for Johnston City (Historical & 5-Year Forecast)
  3. Peer Comparisons (Rank and Percentile)
  1. Neighborhoods Demographics (Home Values, Household Income, etc.)
  2. Illinois Research Tools (Easy Tools & Current Data)
  3. Illinois Data Comparison Tool - 2025 Demographics
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Johnston City, IL Data & Demographics (As of July 1, 2025)

POPULATION

Total Population 3,220 (100%)
Population in Households 3,215 (99.8%)
Population in Families 2,508 (77.9%)
Population in Group Quarters1 5 ( 0.2%)
Population Density 1,522
Diversity Index2 23
 
 

INCOME

Median Household Income $49,834
Average Household Income $68,562
% of Income for Mortgage4 10%
Per Capita Income $31,282
Wealth Index5 50
Socioeconomic Status Index6 Moderate (51.8)
 

HOUSING

Total HU (Housing Units) 1,704 (100%)
Owner Occupied HU 1,089 (63.9%)
Renter Occupied HU 380 (22.3%)
Vacant Housing Units 235 (13.8%)
Median Home Value $82,123
Average Home Value $137,645
Housing Affordability Index3 188
 

HOUSEHOLDS

Total Households 1,469
Average Household Size 2.19
Family Households 878
Average Family Size 3.00
NOTES
  1. Group Quarters - a place where people live or stay in a group living arrangement. Includes college residents halls, nursing facilities, military barracks, and correctional facilities.
  2. 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 races 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.
  3. The Housing Affordability Index base is 100 and represents a balance point where a resident with a median household income can normally qualify to purchase a median price home. Values above 100 indicate increased affordability, while values below 100 indicate decreased affordability.
  4. The % of Income for Mortgage quantifies the percentage of median household income dedicated to mortgage payments on a home priced at the median value (assuming a 30-year mortgage and a 20% down payment).
  5. The Wealth Index is based on a number of indicators of affluence including average household income and average net worth, but it also includes the value of material possessions and resources. It represents the wealth of the area relative to the national level. Values above or below 100 represent above-average wealth or below-average wealth compared to the national level.
  6. The Socioeconomic Index ranges from zero (lowest relative status) to 100 (highest relative status). This measure quantifies disparities in social position of an area's inhabitants and is built from a broad range of demographic, housing, and socioeconomic inputs. More information on this measure can be found in Esri's SEI tutorial.

GROWTH RATE / YEAR

 2020-2025 2025-2030
Population -0.94% -0.48%
Households -0.08% 0.08%
Families   0.34%
Median Household Income   6.06%
Per Capita Income   2.45%
Owner Occupied HU   0.51%

Johnston City, IL - Peer Comparisons by Rank and Percentile

The table below compares Johnston City to the other 1,461 incorporated cities, towns and CDPs in Illinois by rank and percentile using July 1, 2025 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 # 413 72nd
Population Density # 399 73rd
Median Household Income # 1365 7th
Housing Affordability Index # 1262 86th
Per Capita Income # 1227 16th
Diversity Index # 692 53rd

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

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