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 2026 population of 248. Grand Detour is currently declining at a rate of -4.25% annually and its population has decreased by 0% since the most recent census, which recorded a population of 0 in 2020.

The median household income in Grand Detour is $76,406 with a poverty rate of 3.03%. The median age in Grand Detour is 51.6 years: 54.2 years for males, and 44.2 years for females. For every 100 females there are 170.0 males.

248
Total Population
212
Density (mi²)
-11 -4.25%
Growth

Grand Detour Population

Grand Detour Population

Data after 2023 is projected based on recent change

Year ↓
Population
Growth
Annual Change
2026248-11-4.25%
2025259-12-4.43%

Median Age

Overall: 51.6 years
Female: 44.2 years
Male: 54.2 years

Grand Detour Adults

There are 255 adults, (71 of whom are seniors) in Grand Detour.

Sex Ratio

Female: 110 (37%)
Male: 187 (63%)

Demographics

The racial composition of Grand Detour includes 65.66% White, 3.03% other race, and smaller percentages for and multiracial populations.

Population by Race

Race
Population ↓
Percentage (of total)
White19565.66%
Two or more races9331.31%
Other race93.03%
Race
Population ↓
Percentage (of total)
Two or more races9331.31%
Other race93.03%
Race
Population ↓
Percentage (of total)
White19565.66%

Grand Detour Marital Status

Economics and Income Statistics

Grand Detour 's average per capita income is $49,000. Household income levels show a median of $76,406. The poverty rate stands at 3.03%.

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$136,750-
Families$128,854$126,144
Households$76,406$88,699
Non Families-$48,090

$49,000

Average Income

$76,406

Median Household Income

3.03%

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)