Williamson, IL Profile: Facts & Data


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Williamson, Illinois - Basic Facts

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The Village of Williamson had a population of 179 as of July 1, 2022. Williamson ranks in the lower quartile for Population Density when compared to the other cities, towns and Census Designated Places (CDPs) in Illinois. See peer rankings below.

The primary coordinate point for Williamson is located at latitude 38.9856 and longitude -89.764 in Madison County. The formal boundaries for the Village of Williamson encompass a land area of 1.51 sq. miles and a water area of 0.05 sq. miles. Madison County is in the Central time zone (GMT -6). The elevation is 604 feet.

The Village of Williamson has a C1 Census Class Code which indicates an active incorporated place that does not serve as a county subdivision equivalent. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.

The Village of Williamson is located within Township of Olive, a minor civil division (MCD) of Madison County.

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  1. Williamson 2022 Demographic Data
  2. Growth Rates for Williamson (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 - 2022 Demographics

Williamson, IL Data & Demographics (As of July 1, 2022)


Total Population 179 (100%)
Population in Households 179 (100.0%)
Population in Families 151 (84.4%)
Population in Group Quarters1 0
Population Density 153
Diversity Index2 14


Median Household Income $88,066
Average Household Income $92,122
% of Income for Mortgage4 17%
Per Capita Income $37,981
Wealth Index5 74


Total HU (Housing Units) 98 (100%)
Owner Occupied HU 74 (75.5%)
Renter Occupied HU 7 ( 7.1%)
Vacant Housing Units 17 (17.3%)
Median Home Value $282,292
Average Home Value $292,466
Housing Affordability Index3 154


Total Households 81
Average Household Size 2.21
Family Households 60
Average Family Size 3.00
  1. Group Quarters - a place where people live or stay in a group living arrangement. Includes college residents halls, nursing facilities, military barracks, and correctional facilities.
  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 races 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.
  3. The Housing Affordability Index base is 100 and represents a balance point where a resident with a median household income can normally qualify to purchase a median price home. Values above 100 indicate increased affordability, while values below 100 indicate decreased affordability.
  4. The % of Income for Mortgage quantifies the percentage of median household income dedicated to mortgage payments on a home priced at the median value (assuming a 30-year mortgage and a 20% down payment).
  5. The Wealth Index is based on a number of indicators of affluence including average household income and average net worth, but it also includes the value of material possessions and resources. It represents the wealth of the area relative to the national level. Values above or below 100 represent above-average wealth or below-average wealth compared to the national level.


2020-2022 2022-2027
Population -0.98% -0.57%
Households -1.08% -0.25%
Families   -0.34%
Median Household Income   2.04%
Per Capita Income   3.12%
Owner Occupied HU   -0.27%

Williamson, IL - Peer Comparisons by Rank and Percentile

The table below compares Williamson to the other 1,466 incorporated cities, towns and CDPs in Illinois by rank and percentile using July 1, 2022 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 # 1214 17th
Population Density # 1366 7th
Median Household Income # 285 81st
Housing Affordability Index # 499 34th
Per Capita Income # 524 64th
Diversity Index # 1081 27th

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

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