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, Native American, Asian, Native Hawaiian or Pacific Islander and multiracial populations.

Population by Race

White

Two or more races

Other race

Black or African American

Native American

Asian

Native Hawaiian or Pacific Islander

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%
Native American	0	0%
Asian	0	0%
Native Hawaiian or Pacific Islander	0	0%

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