Jefferson County IL Information


Jefferson County Subdivisions

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


Total Population 38,358
Population in Households 36,155
Population in Familes 29,098
Population in Group Qrtrs 2,203
Population Density1 67
Diversity Index2 29


Median Household Income $45,786
Average Household Income $62,338
Per Capita Income $25,467


Total Housing Units 17,033 (100%)
Owner Occupied HU 10,850 (63.7%)
Renter Occupied HU 4,448 (26.1%)
Vacant Housing Units 1,735 (10.2%)
Median Home Value $99,283
Average Home Value $133,210


Total Households 15,298
Average Household Size 2.36
Family Households 9,947
Average Family Size 3
  1. Population Density = Total Population per square mile.
  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 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 -0.15% -0.16%
Households -0.05% -0.11%
Families -0.23% -0.23%
Median Household Income   3.16%
Per Capita Income   2.99%


Jefferson County IL - Peer Comparisons by Rank and Percentile

The table below compares Jefferson 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 # 38 64th
Population Density # 38 64th
Diversity Index # 37 65th
Median Household Income # 78 25th
Per Capita Income # 69 33rd

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