Johnson County IL Information


Johnson County Subdivisions

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


Total Population 13,069
Daytime Population: Workers 2,847
Daytime Population: Residents 6,971
Total Daytime Population (TDP) 9,818
Ratio TDP/Total Population1 0.75
Population in Households 11,305
Population in Familes 9,503
Population in Group Qrtrs 1,764
Population Density2 38
Diversity Index3 29


Median Household Income $46,946
Average Household Income $59,366
Per Capita Income $22,053


Total Housing Units 5,900 (100%)
Owner Occupied HU 3,770 (63.9%)
Renter Occupied HU 951 (16.1%)
Vacant Housing Units 1,179 (20.0%)
Median Home Value $108,824
Average Home Value $132,513


Total Households 4,721
Average Household Size 2.39
Family Households 3,332
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 0.53% -0.03%
Households 0.41% 0.0%
Families 0.26% -0.1%
Median Household Income   2.33%
Per Capita Income   2.73%


Johnson County IL - Peer Comparisons by Rank and Percentile

The table below compares Johnson County to the other 102 counties and county equivalents 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 # 82 21st
Population Density # 66 36th
Diversity Index # 35 67th
Median Household Income # 65 37th
Per Capita Income # 96 7th

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