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.

Demographics

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

Population by Race

White

Two or more races

Black or African American

Asian

Native Hawaiian or Pacific Islander

Native American

Other race

Race	Population	Percentage (of total)
White	1,390	91.51%
Two or more races	85	5.6%
Black or African American	25	1.65%
Asian	13	0.86%
Native Hawaiian or Pacific Islander	6	0.39%
Native American	0	0%
Other race	0	0%

Williamsville Marital Status

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