Frankfort, IL Area Codes
Frankfort, Illinois (population 21,365) uses area codes 779 and 815.
Carriers with Frankfort numbers
14 prefixes are assigned to the Frankfort exchange: 21% mobile, 50% VoIP and cable, 29% landline.
| Carrier | Prefixes |
|---|---|
| AT&T Mobility | 3 |
| AT&T (Illinois Bell) | 3 |
| Lumen (Level 3) | 2 |
| Peerless Network | 1 |
| Comcast (Xfinity) | 1 |
| Bandwidth | 1 |
| Onvoy (Sinch) | 1 |
| Fractel | 1 |
Area codes used in Frankfort
| Area code | Prefixes serving Frankfort | Main carriers in this code |
|---|---|---|
| 779 | 8 | Onvoy (Sinch), AT&T Mobility, Stratus Networks |
| 815 | 6 | Frontier, AT&T (Illinois Bell), Lumen (Level 3) |
Frankfort phone number prefixes
Numbers starting with these first six digits were originally assigned to the Frankfort exchange.
779-216Peerless Network779-243AT&T Mobility779-254Comcast (Xfinity)779-324Bandwidth779-333Onvoy (Sinch)779-339AT&T Mobility779-447AT&T Mobility779-900Fractel815-277AT&T (Teleport)815-412Lumen (Level 3)815-464AT&T (Illinois Bell)815-469AT&T (Illinois Bell)815-534Lumen (Level 3)815-806AT&T (Illinois Bell)
Nearby cities in area code 779
- Joliet
- Rockford
- Plainfield
- Crystal Lake
- DeKalb
- McHenry
- New Lenox
- Lockport
- Woodstock
- Belvidere
- Homer Glen
- Loves Park
Questions
- What is the area code for Frankfort, IL?
- Frankfort uses 2 area codes: 779 and 815. They overlay each other, so all of them cover the whole city and you dial 10 digits for local calls.
- What time zone is Frankfort in?
- Frankfort is in the Central time zone.