Seneca, IL ZIP Codes, Coordinates & Counties
Seneca, Illinois has 1 ZIP code in LaSalle county. The approximate center of Seneca is 41.327, -88.605. Seneca has about 20,401 known street addresses.
ZIP codes in Seneca, IL
| ZIP Code | County | Latitude | Longitude |
|---|---|---|---|
| 61360 | LaSalle | 41.327 | -88.605 |
Counties Seneca spans
LaSalle
Most common streets in Seneca
Canal, 29th, Union, Lincoln, 30th, Lasalle, 28th, Main, Market, Scott
Frequently asked questions
What ZIP codes are in Seneca, IL?
Seneca, Illinois has 1 ZIP code, ranging from 61360 to 61360. The full list, with each ZIP's county and coordinates, is in the table on this page.
What county is Seneca, IL in?
Seneca is in LaSalle county.
What are the latitude and longitude of Seneca, IL?
The approximate center of Seneca, Illinois is latitude 41.327, longitude -88.605. Coordinates for each ZIP code are listed in the table above.
How many ZIP codes does Seneca, IL have?
Seneca has 1 ZIP code.
How many addresses are in Seneca, IL?
Seneca, Illinois has about 20,401 known street addresses in the sthan.io US address database.
What are the most common streets in Seneca, IL?
Some of the most common street names in Seneca are Canal, 29th, Union, Lincoln, 30th, Lasalle.
What cities are near Seneca, IL?
Cities near Seneca include Marseilles (5 mi), Verona (8 mi), Morris (9 mi), Ransom (11 mi), Grand Ridge (12 mi).
Cities near Seneca
Marseilles, IL (5 mi) Verona, IL (8 mi) Morris, IL (9 mi) Ransom, IL (11 mi) Grand Ridge, IL (12 mi) Kinsman, IL (12 mi) Mazon, IL (12 mi) Wedron, IL (12 mi)
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View the API →Last updated: June 2026 · Data: sthan.io US address database