Johnson County IL Information


Johnson County Subdivisions

Johnson County IL Data & Demographics (As of July 1, 2016)


Total Population 13,088
Population in Households 11,535
Population in Familes 9,698
Population in Group Qrtrs 1,553
Population Density1 38
Diversity Index2 27


Total Households 4,810
Average Household Size 2.4
Family Households 3,401
Average Family Size 3


Total Housing Units 6,015 (100%)
Owner Occupied HU 3,853 (64.1%)
Renter Occupied HU 957 (15.9%)
Vacant Housing Units 1,205 (20.0%)
Median Home Value $107,855
Average Home Value $130,827


Median Household Income $41,710
Average Household Income $56,630
Per Capita Income $21,347
  (Compound Annual Growth Rates)


2010-2015 2015-2020
Population 0.63% 0.44%
Households 0.77% 0.53%
Families 0.63% 0.45%
Median Household Income   0.98%
Per Capita Income   1.5%
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.


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, 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 # 83 20th
Population Density1 # 66 36th
Diversity Index2 # 40 62nd
Median Household Income # 81 22nd
Per Capita Income # 95 8th

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