Williamson County IL Information


Williamson County Subdivisions

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


Total Population 68,548
Daytime Population: Workers 28,899
Daytime Population: Residents 37,294
Total Daytime Population (TDP) 66,193
Ratio TDP/Total Population1 0.97
Population in Households 66,393
Population in Familes 52,911
Population in Group Qrtrs 2,155
Population Density2 163
Diversity Index3 21


Median Household Income $43,652
Average Household Income $60,220
Per Capita Income $25,576


Total Housing Units 31,542 (100%)
Owner Occupied HU 19,467 (61.7%)
Renter Occupied HU 8,846 (28.0%)
Vacant Housing Units 3,229 (10.2%)
Median Home Value $90,609
Average Home Value $120,903


Total Households 28,313
Average Household Size 2.34
Family Households 18,354
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 0.45% 0.41%
Households 0.44% 0.45%
Families 0.27% 0.34%
Median Household Income   0.75%
Per Capita Income   2.32%


Williamson County IL - Peer Comparisons by Rank and Percentile

The table below compares Williamson 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 # 22 79th
Population Density # 20 81st
Diversity Index # 50 52nd
Median Household Income # 84 19th
Per Capita Income # 58 45th

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