Seneca is a village in LaSalle County, Illinois, home to about 2,450 people across 6.4 square miles. Its ZIP code is 61360, and parts of 60450 are in Seneca too.
Homes sold for a median of $147 per square foot in the three months ending August 2026, a balanced market.
Mostly Seneca
Mostly Morris; part is in Seneca
Each card is that ZIP code’s whole market, including any part outside Seneca. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Seneca’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Chicago Midway International Airport (MDW)50 miles away |
|---|---|
| Nearest city of 250,000+ | Chicago, IL55 miles away |
Straight-line distances from the center of Seneca; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Seneca had 2,353 residents in the 2020 census, up 15% since 2000.
It’s the 466th largest of 1,450 towns in Illinois by population.
LaSalle County grew from 87,776 residents in 1900 to 109,658 in 2020.
LaSalle County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 85°F in summer, and winter lows average 16°F. About 38.7 inches of rain and melted snow fall in a typical year, with about 25 inches of snow.
Source: NOAA 1991–2020 climate normals, Morris 1 Nw, IL weather station (5 miles away).
33,721 jobs at 2,523 businesses in LaSalle County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
7 doctors and other health care providers list an office in Seneca.
Nearest hospitals
Providers with an office here
| Primary care doctors | 1 |
|---|---|
| Nurse practitioners and physician assistants | 3 |
| Physical and occupational therapists | 1 |
| Chiropractors | 2 |
| Pharmacies | 2 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Grocery stores
Pharmacies
Libraries
Museums
Theaters and performance venues
Counts are within about 2 miles of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Public schools here are run by Seneca CCSD 170, Seneca Twp HSD 160. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Seneca Grade School North CampusSeneca | Pre-K–4 | 256 | Public | 5.3 mi |
| Seneca Elem School South CampusSeneca | 5–8 | 209 | Public | 5.3 mi |
| Seneca High SchoolSeneca | 9–12 | 378 | Public | 4.9 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with Morris and Channahon.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.