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.

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

Race	Population	Percentage (of total)
White	2,269	89.86%
Two or more races	178	7.05%
Other race	50	1.98%
Black or African American	28	1.11%

Seneca Marital Status

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