O'Fallon, IL Area Codes
O'Fallon, Illinois (population 32,656) uses area codes 618 and 730.
Carriers with O'Fallon numbers
10 prefixes are assigned to the O'Fallon exchange: 0% mobile, 30% VoIP and cable, 70% landline.
| Carrier | Prefixes |
|---|---|
| AT&T (Illinois Bell) | 4 |
| Paetec Itel | 1 |
| Lumen (Level 3) | 1 |
| Lumen (CenturyLink) | 1 |
| AT&T (Teleport) | 1 |
| At&T Enterprises | 1 |
| Onvoy (Sinch) | 1 |
Area codes used in O'Fallon
| Area code | Prefixes serving O'Fallon | Main carriers in this code |
|---|---|---|
| 618 | 9 | Frontier, AT&T (Illinois Bell), AT&T Mobility |
| 730 | 1 | AT&T Mobility, Onvoy (Sinch), AT&T (Teleport) |
O'Fallon phone number prefixes
Numbers starting with these first six digits were originally assigned to the O'Fallon exchange.
618-206Paetec Itel618-589Lumen (Level 3)618-607Lumen (CenturyLink)618-622AT&T (Illinois Bell)618-624AT&T (Illinois Bell)618-628AT&T (Illinois Bell)618-632AT&T (Illinois Bell)618-680AT&T (Teleport)618-726At&T Enterprises730-240Onvoy (Sinch)
Nearby cities in area code 618
- Belleville
- Carpentersville
- Granite City
- Edwardsville
- Alton
- Collinsville
- Carbondale
- East St. Louis
- Godfrey
- Marion
- Cahokia Heights
- Fairview Heights
Questions
- What is the area code for O'Fallon, IL?
- O'Fallon uses 2 area codes: 618 and 730. They overlay each other, so all of them cover the whole city and you dial 10 digits for local calls.
- What time zone is O'Fallon in?
- O'Fallon is in the Central time zone.