Seneca
Village in LaSalle County, Illinois

Seneca is a village in LaSalle County, Illinois, with 2,353 residents (2020 Census). It sits at 502 ft (153 m) above sea level. The nearest town is Marseilles, 3.3 miles W.
- 2,353residents (2020 Census)
- 502 ftelevation · 153 m
- 6.0 sq miland area · 15.5 km²
- 393 / sq mipopulation density
- 61360ZIP code
About Seneca
Seneca is a village in LaSalle and Grundy counties in the U.S. state of Illinois. The population was 2,353 at the 2020 census, down from 2,371 at the 2010 census.
The LaSalle County portion of Seneca is part of the Ottawa, IL Micropolitan Statistical Area, while the small portion that lies in Grundy County is part of the Chicago metropolitan area.
Text: Wikipedia · CC BY-SA 4.0
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Living in Seneca
- Median household income
- $86,830
- Median home value
- $227,500
- Median rent
- $1,149/mo
- Median age
- 35.5
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Map of Seneca
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Open in Google Maps ›Seneca, IL population
Seneca had 2,353 residents in the 2020 Census.
| 2020 Census | 2,353 |
|---|---|
| Density | 393 per sq mi (152 per km²) |
Source: U.S. Census Bureau, Decennial Census.
Seneca at a glance
| State | Illinois (IL) |
|---|---|
| County | LaSalle County |
| Type | Village |
| Population | 2,353 (2020) |
| Land area | 5.99 sq mi (15.5 km²) |
| Water area | 0.48 sq mi (1.24 km²) |
| Elevation | 502 ft (153 m) |
| Coordinates | 41.3042° N, 88.6149° W |
| ZIP code | 61360 |
| Census code (GEOID) | 1768640 |
Sources: U.S. Census Bureau (Gazetteer, ZCTA), USGS GNIS, Wikidata.
Towns near Seneca
- Marseilles3.3 mi W
- Kinsman8.2 mi S
- Verona8.4 mi SE
- Ransom10.3 mi S
- Mazon10.9 mi SE
- Morris11.2 mi NE
- Dayton11.3 mi NW
- Ottawa11.4 mi W
- Grand Ridge12.2 mi SW
- Wedron12.4 mi NW
- Naplate13.9 mi W
- Serena14.0 mi NW
Straight-line distance between town centers.
Frequently asked questions about Seneca
What county is Seneca in?
Seneca is in LaSalle County, Illinois.
What is the population of Seneca, IL?
2,353 people lived in Seneca at the 2020 Census.
What is the ZIP code of Seneca, IL?
The ZIP code of Seneca is 61360.
What is the elevation of Seneca?
502 feet (153 m) above sea level.
What towns are near Seneca?
Marseilles (3.3 mi), Kinsman (8.2 mi), Verona (8.4 mi), Ransom (10.3 mi), Mazon (10.9 mi).
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