Oak Brook, IL Area Codes
Oak Brook is served by area codes 312, 331, 630, 708 and 847. It is in Illinois, DuPage County. About 10,144 people live in its 1 ZIP codes.
| Field | Value |
|---|---|
| Area code(s) | 312, 331, 630, 708, 847 … |
| State / province | Illinois |
| County | DuPage County |
| Population | 10,144 |
| ZIP codes | 1 |
| Time zone | Central |
| Coordinates | 41.8364, -87.9532 |
What area code is Oak Brook in?
| Area code | Main state | Population covered | Overlap |
|---|---|---|---|
| 312 | Illinois | 2,795,182 | — |
| 331 | Illinois | 1,454,618 | — |
| 630 | Illinois | 1,832,033 | — |
| 708 | Illinois | 1,731,186 | — |
| 847 | Illinois | 2,332,627 | — |
ZIP codes in the code footprint
Nearby towns and their area codes
Clarendon Hills 312, 331, 630, 708, 847Hinsdale 312, 331, 630, 708, 847Westmont 312, 331, 630, 708, 847Westchester 464, 708La Grange Park 464, 708Western Springs 630, 708Elmhurst 331, 630Lombard 331, 630
How to dial
Dial 312 + 7 digits for a number in Oak Brook, or +1 312 ... from abroad. Ten-digit dialling is required everywhere in the North American Numbering Plan.