Williamsville Flag

Williamsville

County:
Sangamon County
County Seat:
No
Area (mi²):
1.548
State:
Illinois

Williamsville is a village located in Sangamon County, Illinois. Williamsville has a 2025 population of 1,425. Williamsville is currently declining at a rate of -0.14% annually and its population has decreased by -0.84% since the most recent census, which recorded a population of 1,437 in 2020.

The average household income in Williamsville is $131,870 with a poverty rate of 7.55%.The median age in Williamsville is 44.1 years: 40.6 years for males, and 46.8 years for females.

1.4K
Total Population
920
Density (mi²)
-2 -0.14%
Growth

Williamsville Population

Williamsville Population

Data after 2023 is projected based on recent change

Demographics

The racial composition of Williamsville includes 91.51% White, and smaller percentages for Black or African American, Asian, Native Hawaiian or Pacific Islander and multiracial populations.

Population by Race

Race
Population
Percentage (of total)
White1,39091.51%
Two or more races855.6%
Black or African American251.65%
Asian130.86%
Native Hawaiian or Pacific Islander60.39%

Williamsville Marital Status

OverallMalesFemales0%10%20%30%40%50%60%70%80%90%100%

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Williamsville's average per capita income is $65,000. Household income levels show a median of $104,135. The poverty rate stands at 7.55%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.
Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.
Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.
Name
Median
Mean
Married Families$127,143-
Families$125,119$151,339
Households$104,135$131,870
Non Families$65,000$84,344

$65,000

Average Income

$104,135

Median Household Income

7.55%

Poverty Rate

Nearby Cities

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)