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Seneca, IL
Village in LaSalle County, Illinois.
Population
2,450
Land area
6.2sq mi
People per sq mi
395
ZIP codes
0
Seneca and its ZIP codes
Seneca at a glance
- Seneca is 73% denser than Illinois as a whole.
- The median household income is $86,830, 4% above the Illinois median of $83,390.
- A typical owner-occupied home is valued at $227,500 (14% below Illinois) and median rent is $1,149 a month.
Local data for Seneca, IL
Counts from official public data
Housing and community stats
Seneca, IL, American Community Survey 2020-2024
Median household income
$86,830
Poverty rate
22.2%
Median home value
$227,500
Median rent
$1,149/mo
Homeownership
81.3%
Bachelor's or higher
14.9%
Median age
35.5
Average commute
26.2 min
Largest reported origins and ancestries: German Americans (542), Irish Americans (439), Italian Americans (243).
Economy and federal money
Jobs, pay, income and spending are for LaSalle County. PPP loans are for Seneca.
Unemployment rate
4.4%
Aug 2026, -1.2 pts in a year
Average annual pay
$60,975
38,720 jobs, 2025
Income per person
$57,510
BEA, 2024
Federal spending
$719M
FY 2026, $6,555 per person
How people get to work
Seneca, IL, workers 16 and older. American Community Survey 5-year estimates
- Drove alone77.8%
- Carpooled6.8%
- Public transit0.0%
- Walked5.9%
- Bicycle0.0%
- Taxi, ride-hailing, motorcycle or other1.3%
- Worked from home8.2%
Average one-way commute: 26.2 minutes for people who do not work from home.
Environment and hazard risk
Seneca, IL, from FEMA, NOAA and EPA
Natural hazard risk
Relatively Moderate
Top: cold wave
Storm events since 1996
825
Countywide, mostly thunderstorm wind
Flood insurance policies
222
0.5% of homes, county
July high / Jan low
84° / 14°F
39.0 inches of rain a year
Hazards, floods and storm historyCheck a flood zone1 historic places
Health statistics
Share of adults in Seneca, IL, CDC PLACES estimates
Obesity
37.7%
U.S. 33.3% +4.4 pts
Diabetes
10.9%
U.S. 12.1% -1.2 pts
Smoking
15.8%
U.S. 12.8% +3.0 pts
Uninsured (18-64)
7.7%
U.S. 11.1% -3.4 pts
Cities near Seneca
| Name | Distance | Land area (sq mi) |
|---|---|---|
| MarseillesCity | 3.3 mi | 9 |
| VeronaVillage | 9.2 mi | 0.2 |
| KinsmanVillage | 9.4 mi | 0.1 |
| DaytonCensus-designated place | 11 mi | 1.8 |
| MorrisCity | 11 mi | 12.4 |
| MazonVillage | 11 mi | 0.6 |
| WedronCensus-designated place | 12 mi | 0.5 |
| RansomVillage | 12 mi | 1 |
| OttawaCity | 12 mi | 14.9 |
| LisbonVillage | 13 mi | 2.1 |
| Grand RidgeVillage | 13 mi | 0.5 |
| SerenaCensus-designated place | 13 mi | 0.2 |
| NaplateVillage | 14 mi | 0.2 |
| SheridanVillage | 15 mi | 2.1 |
| NewarkVillage | 15 mi | 1.1 |
| Carbon HillVillage | 16 mi | 0.2 |
Frequently asked questions
- What county is Seneca, IL in?
- Seneca is in LaSalle County, Illinois.
- What is the population of Seneca, IL?
- About 2,450 people live in Seneca, based on American Community Survey 5-year estimates.
- What cities are near Seneca?
- Nearby places include Marseilles (3.3 mi), Verona (9.2 mi), Kinsman (9.4 mi), Dayton (11 mi), Morris (11 mi).
Source: U.S. Census Bureau (TIGER/Line boundaries, American Community Survey) · Data as of 12/31/2023