Seneca Flag

Seneca

County:
LaSalle County
County Seat:
No
Area (mi²):
5.957
State:
Illinois

Seneca is a village located in LaSalle County, Illinois. Seneca has a 2026 population of 2,292. Seneca is currently declining at a rate of -0.39% annually and its population has decreased by -2.26% since the most recent census, which recorded a population of 2,345 in 2020.

The median household income in Seneca is $86,830 with a poverty rate of 22.16%. The median age in Seneca is 35.5 years: 34.9 years for males, and 35.7 years for females. For every 100 females there are 117.8 males.

2.3K
Total Population
385
Density (mi²)
-9 -0.39%
Growth

Seneca Population

Seneca Population

Data after 2023 is projected based on recent change

Year ↓
Population
Growth
Annual Change
20262,292-9-0.39%
20252,301-9-0.39%
20242,310-3-0.13%
20232,31310.04%
20222,312-23-0.99%
20212,335-10-0.43%
20202,345-5-0.21%
20192,241-2-0.09%
20182,243-7-0.31%
20172,250-11-0.49%
20162,261-12-0.53%
20152,273-13-0.57%
20142,286-16-0.7%
20132,302-20-0.86%
20122,322-20-0.85%
20112,342-29-1.22%
20102,352-2-0.08%

Median Age

Overall: 35.5 years
Female: 35.7 years
Male: 34.9 years

Seneca Adults

There are 1,749 adults, (296 of whom are seniors) in Seneca.

Sex Ratio

Female: 1,125 (45.9%)
Male: 1,325 (54.1%)

Demographics

The racial composition of Seneca includes 88.94% White, and smaller percentages for other race, Black or African American, Native American and multiracial populations.

Population by Race

Race
Population ↓
Percentage (of total)
White2,17988.94%
Two or more races1998.12%
Other race492%
Black or African American220.9%
Native American10.04%
Race
Population ↓
Percentage (of total)
Two or more races1395.67%
White582.37%
Other race492%
Race
Population ↓
Percentage (of total)
White2,12186.57%
Two or more races602.45%
Black or African American220.9%
Native American10.04%

Seneca Marital Status

Economics and Income Statistics

Seneca 's average per capita income is $48,393. Household income levels show a median of $86,830. The poverty rate stands at 22.16%.

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$115,500-
Families$105,125$117,525
Households$86,830$111,346
Non Families$58,929$83,820

$48,393

Average Income

$86,830

Median Household Income

22.16%

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)