Grand Detour

County:: Lee County
County Seat:: No
Area (mi²):: 1.17
State:: Illinois

Grand Detour is a CDP located in Lee County, Illinois. Grand Detour has a 2025 population of 270. Grand Detour is currently declining at a rate of -3.91% annually and its population has decreased by -23.08% since the most recent census, which recorded a population of 351 in 2020.

The average household income in Grand Detour is $88,649 with a poverty rate of 4.61%. The median age in Grand Detour is 54 years: 54.5 years for males, and 44 years for females.

Demographics

The racial composition of Grand Detour includes 67.73% White, 4.61% other race, and smaller percentages for Black or African American, Native American, Asian, Native Hawaiian or Pacific Islander and multiracial populations.

Population by Race

White

Two or more races

Other race

Black or African American

Native American

Asian

Native Hawaiian or Pacific Islander

Race	Population	Percentage (of total)
White	191	67.73%
Two or more races	78	27.66%
Other race	13	4.61%
Black or African American	0	0%
Native American	0	0%
Asian	0	0%
Native Hawaiian or Pacific Islander	0	0%

Grand Detour Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Grand Detour's average per capita income is $48,594. Household income levels show a median of $74,141. The poverty rate stands at 4.61%.

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	$133,846	-
Families	$126,176	$121,578
Households	$74,141	$88,649
Non Families	$45,714	$43,229

$48,594

Average Income

$74,141

Median Household Income

4.61%

Poverty Rate