South Wilmington

County:: Grundy County
County Seat:: No
Area (mi²):: 0.492
State:: Illinois

South Wilmington is a village located in Grundy County, Illinois. South Wilmington has a 2025 population of 723. South Wilmington is currently growing at a rate of 0.56% annually and its population has increased by 2.55% since the most recent census, which recorded a population of 705 in 2020.

The average household income in South Wilmington is $99,435 with a poverty rate of 6.45%. The median age in South Wilmington is 46.3 years: 42.7 years for males, and 47.7 years for females.

Demographics

The racial composition of South Wilmington includes 98.57% White, and smaller percentages for Two or more races, Asian, Black or African American, Native American, Native Hawaiian or Pacific Islander, other race and multiracial populations.

Population by Race

White

Two or more races

Asian

Black or African American

Native American

Native Hawaiian or Pacific Islander

Other race

Race	Population	Percentage (of total)
White	550	98.57%
Two or more races	6	1.08%
Asian	2	0.36%
Black or African American	0	0%
Native American	0	0%
Native Hawaiian or Pacific Islander	0	0%
Other race	0	0%

South Wilmington Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

South Wilmington's average per capita income is $60,000. Household income levels show a median of $86,563. The poverty rate stands at 6.45%.

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	$105,781	-
Families	$105,469	$114,878
Households	$86,563	$99,435
Non Families	$46,250	$57,803

$60,000

Average Income

$86,563

Median Household Income

6.45%

Poverty Rate