Hennepin Flag

Hennepin

County:
Putnam County
County Seat:
Yes
Area (mi²):
5.307
State:
Illinois

Hennepin is a village located in Putnam County, Illinois. Hennepin has a 2026 population of 741. It is also the county seat of Putnam County. Hennepin is currently declining at a rate of -0.4% annually and its population has decreased by -2.37% since the most recent census, which recorded a population of 759 in 2020.

The median household income in Hennepin is $83,000 with a poverty rate of 7.96%. The median age in Hennepin is 38.3 years: 37 years for males, and 38.9 years for females. For every 100 females there are 104.2 males.

741
Total Population
140
Density (mi²)
-3 -0.4%
Growth

Hennepin Population

Hennepin Population

Data after 2023 is projected based on recent change

Year ↓
Population
Growth
Annual Change
2026741-3-0.4%
2025744-3-0.4%
202474720.27%
202374510.13%
2022744-5-0.67%
2021749-10-1.32%
2020759-1-0.13%
2019707-1-0.14%
201870830.43%
2017705-3-0.42%
2016708-3-0.42%
2015711-17-2.34%
2014728-4-0.55%
2013732-12-1.61%
2012744-10-1.33%
2011754-3-0.4%
201076100%

Median Age

Overall: 38.3 years
Female: 38.9 years
Male: 37 years

Hennepin Adults

There are 706 adults, (144 of whom are seniors) in Hennepin.

Sex Ratio

Female: 455 (49%)
Male: 474 (51%)

Demographics

The racial composition of Hennepin includes 94.94% White, and smaller percentages for other race, Black or African American and multiracial populations.

Population by Race

Race
Population ↓
Percentage (of total)
White88294.94%
Two or more races394.2%
Other race60.65%
Black or African American20.22%
Race
Population ↓
Percentage (of total)
White333.55%
Two or more races192.05%
Other race60.65%
Race
Population ↓
Percentage (of total)
White84991.39%
Two or more races202.15%
Black or African American20.22%

Hennepin Marital Status

Economics and Income Statistics

Hennepin 's average per capita income is $52,689. Household income levels show a median of $83,000. The poverty rate stands at 7.96%.

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$122,639-
Families$95,515$109,025
Households$83,000$98,082
Non Families$50,179$74,893

$52,689

Average Income

$83,000

Median Household Income

7.96%

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)