Ottawa, IL Area Codes
Ottawa is served by area code 815. It is in Illinois, LaSalle County. About 23,713 people live in its 1 ZIP codes.
| Field | Value |
|---|---|
| Area code(s) | 815 |
| State / province | Illinois |
| County | LaSalle County |
| Population | 23,713 |
| ZIP codes | 1 |
| Time zone | Central |
| Coordinates | 41.3721, -88.8651 |
What area code is Ottawa in?
| Area code | Main state | Population covered | Overlap |
|---|---|---|---|
| 815 | Illinois | 1,706,456 | — |
ZIP codes in the code footprint
Nearby towns and their area codes
La Salle 779, 815Peru 779, 815Streator 779, 815Morris 779, 815Sandwich 779, 815Plano 331, 630Yorkville 331, 630Minooka 779, 815
How to dial
Dial 815 + 7 digits for a number in Ottawa, or +1 815 ... from abroad. Ten-digit dialling is required everywhere in the North American Numbering Plan.