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Spring Valley, IL Area Codes
Spring Valley, Illinois (population 5,408) uses area codes 779 and 815.
Carriers with Spring Valley numbers
4 prefixes are assigned to the Spring Valley exchange: 25% mobile, 25% VoIP and cable, 50% landline.
| Carrier | Prefixes |
|---|---|
| Frontier | 2 |
| T-Mobile | 1 |
| Peerless Network | 1 |
Area codes used in Spring Valley
| Area code | Prefixes serving Spring Valley | Main carriers in this code |
|---|---|---|
| 779 | 2 | Onvoy (Sinch), AT&T Mobility, Stratus Networks |
| 815 | 2 | Frontier, AT&T (Illinois Bell), Lumen (Level 3) |
Spring Valley phone number prefixes
Numbers starting with these first six digits were originally assigned to the Spring Valley exchange.
779-349T-Mobile779-717Peerless Network815-663Frontier815-664Frontier
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 Spring Valley, IL?
- Spring Valley 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 Spring Valley in?
- Spring Valley is in the Central time zone.