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 2026 population of 1,441. Williamsville is currently declining at a rate of 0% annually and its population has increased by 0.07% since the most recent census, which recorded a population of 1,440 in 2020.

The median household income in Williamsville is $106,731 with a poverty rate of 6.88%. The median age in Williamsville is 43.4 years: 36.6 years for males, and 47.2 years for females. For every 100 females there are 104.0 males.

1.4K
Total Population
931
Density (mi²)

Williamsville Population

Williamsville Population

Data after 2023 is projected based on recent change

Year ↓
Population
Growth
Annual Change
20261,44100%
20251,44100%
20241,44140.28%
20231,43710.07%
20221,436-2-0.14%
20211,438-2-0.14%
20201,44030.21%
20191,487-6-0.4%
20181,493-3-0.2%
20171,49670.47%
20161,489-3-0.2%
20151,49220.13%
20141,490-1-0.07%
20131,49110.07%
20121,49080.54%
20111,48260.41%
20101,47410.07%

Median Age

Overall: 43.4 years
Female: 47.2 years
Male: 36.6 years

Williamsville Adults

There are 972 adults, (237 of whom are seniors) in Williamsville.

Sex Ratio

Female: 644 (49%)
Male: 670 (51%)

Demographics

The racial composition of Williamsville includes 87.29% 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)
White1,14787.29%
Two or more races1209.13%
Black or African American221.67%
Asian211.6%
Native Hawaiian or Pacific Islander40.3%
Race
Population ↓
Percentage (of total)
Two or more races211.6%
White70.53%
Race
Population ↓
Percentage (of total)
White1,14086.76%
Two or more races997.53%
Black or African American221.67%
Asian211.6%
Native Hawaiian or Pacific Islander40.3%

Williamsville Marital Status

Economics and Income Statistics

Williamsville 's average per capita income is $65,313. Household income levels show a median of $106,731. The poverty rate stands at 6.88%.

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$135,521-
Families$131,111$137,115
Households$106,731$120,105
Non Families$59,643$71,314

$65,313

Average Income

$106,731

Median Household Income

6.88%

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)