951 area code — Riverside, CA geographic
- State
- California
- Major area
- Riverside
- Time zone
- Pacific
- In service since
- 2004-07-17
- Split from
- 909
- Active prefixes
- 686
- Rate centers
- 21
- Carriers
- 36
- Projected exhaust
- 4Q 2031
The 951 area code covers Riverside, California, Pacific time zone, and dates back to July 17, 2004. Because of number portability and VoIP, the area code tells you where the number was issued, not where the caller is right now.
NANPA lists 686 active NXX prefixes in 951, assigned to 36 carriers. 535 of those prefixes are pooled — shared between carriers in thousands-number blocks. The code spans 21 rate centers (billing localities).
Official projections put exhaust at 4Q 2031 — relief planning typically starts years ahead.
The dialing plan is 1+10D for home-NPA local calls and 1+10D across codes.
Practical takeaway: the 951 label narrows geography to California, the prefix narrows it to a locality, and neither authenticates a caller. Verification means calling back through a number you found yourself.
Its parent code is 909, which it left in 2004.
Largest localities in 951
| Locality (rate center) | Active prefixes | Also served by |
|---|---|---|
| Riverside | 148 | 909 |
| Corona | 87 | 909 |
| Temecula | 57 | — |
| Perris | 54 | — |
| Moreno | 52 | — |
| Arlington | 48 | — |
| Murrieta | 39 | — |
| Hemet:hemet Da | 37 | 909 |
| Elsinore | 22 | — |
| Sun City | 21 | — |
FAQ
Will 951 run out of numbers?
NANPA's current forecast projects exhaust in 4Q 2031, so a new overlay is likely to be planned.
Why am I getting spam calls from 951 numbers?
Scammers spoof recognizable area codes so calls look local or familiar. A displayed 951 number does not prove the call originated there — see our guide to spotting spoofed calls.
Where is a 951 number from?
951 is assigned to Riverside and surrounding areas of California in the Pacific time zone. The three digits after the area code (the prefix) narrow it down to a rate center.