Area code 331 — Illinois
Area code 331 is in Illinois. Time zone, overlays, counties and ZIP codes.
| Location | 331, 575, 762, 779 |
|---|---|
| State | Illinois |
| Status | In service · since 2007 |
| Time zone | Central · |
| Overlay codes | 630 Overlays share the same area. Local calls usually need 10-digit dialing. |
| Local dialing | 1+10D |
Counties (approximate)
CookCook CountyDuPage County
ZIP codes in area code 331
Approximate: area code boundaries follow telephone rate centers, not ZIP codes.
60130 Forest Park60141 Hines60153 Maywood60154 Westchester60155 Broadview60301 Oak Park60302 Oak Park60303 Oak Park60304 Oak Park60305 River Forest60402 Berwyn60406 Blue Island60409 Calumet City60415 Chicago Ridge60419 Dolton60453 Oak Lawn60454 Oak Lawn60455 Bridgeview60456 Hometown60457 Hickory Hills60458 Justice60459 Burbank60465 Palos Hills60482 Worth60499 Bedford Park60501 Summit Argo60513 Brookfield60521 Hinsdale60525 La Grange60526 La Grange Park60534 Lyons60546 Riverside60558 Western Springs60601 Chicago60602 Chicago60603 Chicago60604 Chicago60605 Chicago60606 Chicago60607 Chicago
Format a 331 number
US numbers are written as (331) 555-0123 or 331-555-0123. From outside the US, dial +1 331 555 0123.
Is a call from 331 a scam?
An area code only tells you where a number was assigned. Caller ID can be faked (“spoofed”), so do not trust a call just because the area code looks local. Never share codes or payment details with unexpected callers.
Sources: NANPA via NumberResearch.org (CC BY 4.0); place names and history from Wikipedia (CC BY-SA 4.0). See data sources.