Johnson County IL Information


Johnson County Subdivisions

Johnson County IL Data & Demographics (As of July 1, 2018)


Total Population 13,031
Population in Households 11,233
Population in Familes 9,467
Population in Group Qrtrs 1,798
Population Density2 38
Diversity Index3 29


Median Household Income $48,795
Average Household Income $60,643
Per Capita Income $22,550


Total Housing Units 5,809 (100%)
Owner Occupied HU 3,979 (68.5%)
Renter Occupied HU 733 (12.6%)
Vacant Housing Units 1,097 (18.9%)
Median Home Value $109,051
Average Home Value $136,894


Total Households 4,712
Average Household Size 2.38
Family Households 3,320
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 0.43% -0.04%
Households 0.33% 0.02%
Families 0.18% -0.08%
Median Household Income   1.15%
Per Capita Income   1.66%


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, 2018 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 # 83 20th
Population Density # 65 37th
Diversity Index # 34 67th
Median Household Income # 63 39th
Per Capita Income # 96 7th

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