Island Grove township

County:: Sangamon County
County Seat:: No
Area (mi²):: 28.066
State:: Illinois

Island Grove township is located in Sangamon County, Illinois. Island Grove township has a 2025 population of 560. Island Grove township is currently declining at a rate of -0.36% annually and its population has decreased by -2.27% since the most recent census, which recorded a population of 573 in 2020.

The average household income in Island Grove township is $145,346 with a poverty rate of 4.9%. The median age in Island Grove township is 55.8 years: 53.8 years for males, and 58.5 years for females.

Demographics

The racial composition of Island Grove township includes 93.17% White, 6.83% Black or African American, and smaller percentages for Native American, Asian, Native Hawaiian or Pacific Islander, other race, Two or more races and multiracial populations.

Population by Race

White

Black or African American

Native American

Asian

Native Hawaiian or Pacific Islander

Other race

Two or more races

Race	Population	Percentage (of total)
White	532	93.17%
Black or African American	39	6.83%
Native American	0	0%
Asian	0	0%
Native Hawaiian or Pacific Islander	0	0%
Other race	0	0%
Two or more races	0	0%

Island Grove township Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Island Grove township's average per capita income is $54,152. Household income levels show a median of $94,500. The poverty rate stands at 4.9%.

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	$119,244	-
Families	$118,750	$173,383
Households	$94,500	$145,346
Non Families	$13,281	$27,593

$54,152

Average Income

$94,500

Median Household Income

4.9%

Poverty Rate