Williamson County IL Information


Williamson County Subdivisions

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  1. Williamson County 2018 Demographic Data
  2. Growth Rates forWilliamson County (Historical & 5-Year Forecast)
  3. Peer Comparisons (Rank and Percentile)
  1. Neighborhoods Demographics (Home Values, Household Income, etc.)
  2. Illinois Research Tools (Easy Tools & Current Data)
  3. Illinois Data Comparison Tool - 2018 Demographics

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


Total Population 68,628
Population in Households 66,457
Population in Familes 53,149
Population in Group Qrtrs 2,171
Population Density2 163
Diversity Index3 22


Median Household Income $44,572
Average Household Income $61,269
Per Capita Income $26,042


Total Housing Units 31,619 (100%)
Owner Occupied HU 18,382 (58.1%)
Renter Occupied HU 9,998 (31.6%)
Vacant Housing Units 3,239 (10.2%)
Median Home Value $97,878
Average Home Value $130,339


Total Households 28,380
Average Household Size 2.34
Family Households 18,353
Average Family Size 3
  1. Demographics are point estimates for July 1st of the current year and each for the forecast years. See References for more information.
  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.


2010-2018 2018-2023
Population 0.41% 0.36%
Households 0.42% 0.41%
Families 0.24% 0.28%
Median Household Income   1.62%
Per Capita Income   2.3%


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, 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 # 22 79th
Population Density # 20 81st
Diversity Index # 50 52nd
Median Household Income # 85 18th
Per Capita Income # 61 41st

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

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Illinois Census Data Comparison Tool

Compare Illinois July 1, 2018 Data
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