Illinois Gazetteer
Also See Williamsville, IL: ZIP Codes & Maps
The Village of Williamsville had a population of 1,470 as of July 1, 2025.
The primary coordinate point for Williamsville is located at latitude 39.9542 and longitude -89.5487 in Sangamon County. The formal boundaries for the Village of Williamsville encompass a land area of 1.26 sq. miles and a water area of 0 sq. miles. Sangamon County is in the Central time zone (GMT -6).
The Village of Williamsville 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 Williamsville is located within Township of Williams, a minor civil division (MCD) of Sangamon County.
POPULATION | |
|---|---|
| Total Population | 1,470 (100%) |
| Population in Households | 1,470 (100.0%) |
| Population in Families | 1,236 (84.1%) |
| Population in Group Quarters1 | 0 |
| Population Density | 949 |
| Diversity Index2 | 15 |
INCOME | |
| Median Household Income | $138,604 |
| Average Household Income | $173,210 |
| % of Income for Mortgage4 | 12% |
| Per Capita Income | $70,227 |
| Wealth Index5 | 165 |
| Socioeconomic Status Index6 | Moderate (62.0) |
HOUSING | |
|---|---|
| Total HU (Housing Units) | 639 (100%) |
| Owner Occupied HU | 513 (80.3%) |
| Renter Occupied HU | 83 (13.0%) |
| Vacant Housing Units | 43 ( 6.7%) |
| Median Home Value | $263,073 |
| Average Home Value | $271,248 |
| Housing Affordability Index3 | 171 |
HOUSEHOLDS | |
| Total Households | 596 |
| Average Household Size | 2.47 |
| Family Households | 433 |
| Average Family Size | 3.00 |
GROWTH RATE / YEAR |
2020-2025 | 2025-2030 |
|---|---|---|
| Population | 0.59% | -0.11% |
| Households | 1.13% | 0.33% |
| Families | 0.73% | |
| Median Household Income | 2.71% | |
| Per Capita Income | 3.41% | |
| Owner Occupied HU | 0.43% |
The table below compares Williamsville to the other 1,461 incorporated cities, towns and CDPs in Illinois by rank and percentile using July 1, 2025 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 | # 566 | 61st |
| Population Density | # 723 | 51st |
| Median Household Income | # 73 | 95th |
| Housing Affordability Index | # 1153 | 79th |
| Per Capita Income | # 62 | 96th |
| Diversity Index | # 1067 | 27th |
Additional comparisons and rankings can be made with a VERY EASY TO USE Illinois Census Data Comparison Tool.
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