Seneca township

County:: LaSalle County
County Seat:: No
Area (mi²):: 35.868
State:: Illinois

Seneca township is located in LaSalle County, Illinois. Seneca township has a 2025 population of 2,876. Seneca township is currently declining at a rate of 0% annually and its population has decreased by -0.48% since the most recent census, which recorded a population of 2,890 in 2020.

The average household income in Seneca township is $163,181 with a poverty rate of 0.45%. The median age in Seneca township is 37 years: 39.1 years for males, and 35.8 years for females.

Demographics

The racial composition of Seneca township includes 87.83% White, 3.4% other race, and smaller percentages for 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	2,533	87.83%
Two or more races	247	8.56%
Other race	98	3.4%
Black or African American	6	0.21%
Native American	0	0%
Asian	0	0%
Native Hawaiian or Pacific Islander	0	0%

Seneca township Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Seneca township's average per capita income is $66,591. Household income levels show a median of $134,795. The poverty rate stands at 0.45%.

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	$166,569	-
Families	$165,074	$174,539
Households	$134,795	$163,181
Non Families	-	$92,638

$66,591

Average Income

$134,795

Median Household Income

0.45%

Poverty Rate