Williamsville, Illinois Demographics & Population 2026
During the 2020–2024 ACS period, Williamsville, Illinois had a total population of 1,314, the 620th largest village in Illinois, with a median household income of $106,731, which is 28% higher than the state average. The poverty rate is 6.9%.
Data vintage: U.S. Census Bureau ACS 2020–2024 5-Year Estimates · refreshed July 2026 · Methodology & source notes
Key Takeaways
- 45.2% of adults hold a bachelor's degree or higher — top 10% in Illinois.
- Housing is very affordable with a home-value-to-income ratio of just 1.9x.
- Near full employment with an unemployment rate of just 1.0%.
Williamsville Quick Facts
How Williamsville Changed
Change from the 2019–2023 ACS period to 2020–2024. These are rolling five-year estimates, not year-over-year measurements.
| Metric | 2019–2023 | 2020–2024 | Change |
|---|---|---|---|
| Population | 1,519 | 1,314 | -13.5% |
| Median household income | $104,135 | $106,731 | +2.5% |
| Median home value | $187,000 | $199,300 | +6.6% |
How Williamsville Compares
Median Household Income
Median Home Value
Economy & Housing
Household Income Distribution
Detailed income brackets
Employment
Housing Overview
People & Demographics
Age Distribution
Race & Ethnicity
Diversity Index
A less diverse community where one racial or ethnic group represents a large majority.
State average: 61 | National average: 61
Education
Educational Attainment (Adults 25+)
Williamsville Rankings in Illinois
Explore Illinois Rankings
Other Cities in Sangamon County
| City | Population | Median Income | Poverty | Home Value |
|---|---|---|---|---|
| Springfield | 113,330 | $66,064 | 16.8% | $162,100 |
| Chatham | 14,639 | $106,773 | 3.3% | $243,200 |
| Sherman | 4,386 | $148,906 | 2.2% | $297,800 |
| Auburn | 4,306 | $81,411 | 8.1% | $149,600 |
| Rochester | 3,766 | $117,118 | 2.5% | $238,900 |
| Riverton | 3,513 | $80,920 | 0.9% | $152,200 |
| Virden | 3,171 | $80,577 | 10.2% | $101,300 |
| Pawnee | 2,738 | $81,103 | 14.2% | $149,500 |
| Jerome | 1,807 | $65,189 | 6.4% | $127,800 |
| Southern View | 1,751 | $57,270 | 14.9% | $105,300 |
Cities Similar to Williamsville
These cities in the same state have comparable population and economic profiles.
| City | Population | Median Income | Home Value | Bachelor's+ | Poverty |
|---|---|---|---|---|---|
| North Utica | 1,282 | $104,028 | $237,500 | 20.0% | 4.7% |
| Albers | 1,280 | $109,583 | $210,200 | 22.9% | 7.2% |
| Capron | 1,311 | $90,192 | $160,100 | 10.3% | 8.9% |
| Limestone | 1,419 | $103,906 | $212,200 | 23.6% | 4.7% |
| Germantown | 1,350 | $92,083 | $192,500 | 26.7% | 5.4% |
Population Overview
Williamsville is a small community located in Illinois, within Sangamon County. The total population is 1,314. It ranks as the 620th most populous out of 1,445 Census-designated places in Illinois.
Age Demographics
The median age in Williamsville is 43.4 years. This is 11% higher than the state median of 39.0 years.
Economy, Income & Housing
The median household income in Williamsville is $106,731. This is 28% higher than the state median of $83,390. It is also 32% higher than the national median of $80,734. The poverty rate stands at 6.9%. This is 42% lower than the state poverty rate of 11.8%. The unemployment rate is 1.0%. This is 82% lower than the state rate of 5.8%. The median home value is $199,300. Housing costs are 24% lower than the state median of $263,300. With a home-value-to-income ratio of just 1.9x, Williamsville is one of the most affordable housing markets in the area. 88.1% of occupied housing units are owner-occupied. This homeownership rate is 31% higher than the state average of 67.1%.
Race & Ethnicity
Williamsville has a predominantly White (non-Hispanic) population, comprising 86.8% of all residents. Hispanic or Latino residents account for 2.1%. The Black or African American population (1.7%) is well below the state average of 13.3%. The Hispanic or Latino population (2.1%) is well below the state average of 18.8%. The Asian population (1.6%) is well below the state average of 5.9%.
Education
45.2% of residents aged 25 and older hold a bachelor's degree or higher. This places Williamsville in the top 10% of all cities in the state for educational attainment. This is 19% higher than the state rate of 37.9%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 92.0%. Notably, 16.1% of adults hold a graduate or professional degree, indicating a highly educated workforce.
Data Sources & Methodology
All demographic data for Williamsville, Illinois is sourced from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates. The ACS collects data from approximately 3.5 million households annually and pools five years of responses so that even small communities can be measured, though the margin of error widens as the population falls. Comparisons are made against Illinois state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 1,445 Census-designated places in Illinois. Read more about how these figures are produced on our methodology page, or visit data.census.gov for official data.
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Frequently Asked Questions
What is the population of Williamsville, Illinois?
Williamsville, Illinois has a population of 1,314 according to the most recent U.S. Census ACS 5-Year Estimates.
What is the median household income in Williamsville, IL?
The median household income in Williamsville is $106,731, which is 32% higher than the national median of $80,734.
What is the poverty rate in Williamsville, IL?
The poverty rate in Williamsville is 6.9%. This means approximately 90 residents live below the federal poverty line.
What is the racial makeup of Williamsville, Illinois?
Williamsville's population is 86.8% White, 1.7% Black, 2.1% Hispanic/Latino, and 1.6% Asian.
What is the median home value in Williamsville, IL?
The median home value in Williamsville is $199,300. The home-value-to-income ratio is 1.9x.
How educated is Williamsville, Illinois?
45.2% of adults (25+) in Williamsville hold a bachelor's degree or higher, and 16.1% hold a graduate or professional degree.