Rock Falls, IL Area Codes
Rock Falls, Illinois (population 8,521) uses area codes 815 and 779.
Rock Falls has no telephone exchange of its own in NANPA records; it is served by the Sterling exchange about 3.1 km away.
Carriers with Rock Falls numbers
21 prefixes are assigned to the Sterling exchange: 33% mobile, 10% VoIP and cable, 57% landline.
| Carrier | Prefixes |
|---|---|
| AT&T (Illinois Bell) | 8 |
| UScellular | 3 |
| T-Mobile | 3 |
| Lumen (Level 3) | 1 |
| Verizon Wireless | 1 |
| Metropcs | 1 |
| Ip Horizon | 1 |
| Wavenation | 1 |
Area codes used in Rock Falls
| Area code | Prefixes serving Rock Falls | Main carriers in this code |
|---|---|---|
| 815 | 15 | Frontier, AT&T (Illinois Bell), Lumen (Level 3) |
| 779 | 6 | Onvoy (Sinch), AT&T Mobility, Stratus Networks |
Rock Falls phone number prefixes
Numbers starting with these first six digits were originally assigned to the Sterling exchange.
815-213UScellular815-380Lumen (Level 3)815-441Verizon Wireless815-499UScellular815-535AT&T (Illinois Bell)815-548AT&T (Illinois Bell)815-564AT&T (Illinois Bell)815-590T-Mobile815-622AT&T (Illinois Bell)815-625AT&T (Illinois Bell)815-626AT&T (Illinois Bell)815-631AT&T (Illinois Bell)815-632AT&T (Illinois Bell)815-716Metropcs815-718UScellular779-245T-Mobile779-250T-Mobile779-297Ip Horizon779-430Wavenation779-587Ahoi779-790Commio
Nearby cities in area code 815
- Joliet
- Rockford
- Plainfield
- Crystal Lake
- DeKalb
- McHenry
- New Lenox
- Lockport
- Woodstock
- Belvidere
- Homer Glen
- Loves Park
Questions
- What is the area code for Rock Falls, IL?
- Rock Falls uses 2 area codes: 815 and 779. They overlay each other, so all of them cover the whole city and you dial 10 digits for local calls.
- What time zone is Rock Falls in?
- Rock Falls is in the Central time zone.