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 and multiracial populations.

Population by Race

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%

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