Seneca, IL ZIP code
The ZIP code for Seneca, Illinois is 61360. It is in LaSalle County.
- Population in these ZIPs
- 3,610
- Avg. median income
- $95,100population-weighted
- Typical home value
- $231,800population-weighted
- Metro area
- Ottawa, IL
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Seneca, IL ZIP code list
| ZIP code | Population | Median income | Typical home value |
|---|---|---|---|
| 61360 | 3,610 | $95,093 | $231,800 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities near Seneca
- Marseilles 5 mi
- Verona 8 mi
- Morris 9 mi
- Ransom 12 mi
- Mazon 12 mi
- Kinsman 12 mi
- Grand Ridge 13 mi
- Newark 13 mi
- Serena 14 mi
- Ottawa 14 mi
- Sheridan 14 mi
- Millington 16 mi
Frequently asked questions
What is the ZIP code for Seneca, IL?
The ZIP code for Seneca, IL is 61360.
What county is Seneca, Illinois in?
Seneca ZIP codes are in LaSalle County.