Seneca Flag

Seneca

County:
LaSalle County
County Seat:
No
Area (mi²):
6.205
State:
Illinois

Seneca is a village located in LaSalle County, Illinois. Seneca has a 2025 population of 2,289. Seneca is currently declining at a rate of -0.48% annually and its population has decreased by -2.3% since the most recent census, which recorded a population of 2,343 in 2020.

The average household income in Seneca is $116,204 with a poverty rate of 19.37%.The median age in Seneca is 35.2 years: 34.7 years for males, and 35.7 years for females.

2.3K
Total Population
369
Density (mi²)
-11 -0.48%
Growth

Seneca Population

Seneca Population

Data after 2023 is projected based on recent change

Demographics

The racial composition of Seneca includes 89.86% White, and smaller percentages for other race, Black or African American and multiracial populations.

Population by Race

White (89.9%)

Two or more races (7.0%)

Other race (2.0%)

Black or African American (1.1%)

Race
Population
Percentage (of total)
White2,26989.86%
Two or more races1787.05%
Other race501.98%
Black or African American281.11%

Seneca Marital Status

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

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Seneca's average per capita income is $51,477. Household income levels show a median of $91,065. The poverty rate stands at 19.37%.

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$118,500-
Families$110,313$124,637
Households$91,065$116,204
Non Families$70,020$80,088

$51,477

Average Income

$91,065

Median Household Income

19.37%

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)