Grand Detour Flag

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.

270
Total Population
231
Density (mi²)
-11 -3.91%
Growth

Grand Detour Population

Grand Detour Population

Data after 2023 is projected based on recent change

Demographics

The racial composition of Grand Detour includes 67.73% White, 4.61% other race, and smaller percentages for and multiracial populations.

Population by Race

Race
Population
Percentage (of total)
White19167.73%
Two or more races7827.66%
Other race134.61%

Grand Detour Marital Status

OverallMalesFemales0%10%20%30%40%50%60%70%80%90%100%

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

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)