Riverside, CA — rate center
- State
- California
- Active prefixes
- 155
- Carriers
- 21
- Pooled prefixes
- 86
- LATA
- 730
- Metro area
- Riverside-San Bernardino-Ontario, CA MSA
In NANP numbering, Riverside, California is a rate center — the anchor point for local numbers. It is reached through 909, 951 (multiple area codes serve it).
The rate center currently carries 155 working prefixes, held by 21 different carriers. Pooling applies to 86 of them — individual thousands-blocks may belong to different companies.
The rate center belongs to the Riverside-San Bernardino-Ontario, CA Metropolitan Statistical Area. Routing-wise it sits in LATA 730.
Because 909, 951 all serve this territory, two Riverside numbers can look completely different while being neighbors — check the prefix, not just the area code.
Riverside ranks among the larger numbering localities in California: 155 prefixes mean over 1,550,000 assignable numbers anchored here.
A Riverside prefix on caller ID is a starting point, not proof of origin — numbers travel with their owners and displays can be spoofed. Use official callback numbers for anything sensitive.
Prefixes anchored to Riverside
| Prefix | Code holder | Pooled |
|---|---|---|
| 909-209 | AMERICAN MESSAGING SERVICES, LLC | No |
| 909-290 | SPOK, INC. | No |
| 909-339 | 33 WIRELESS INC. | No |
| 909-412 | SPOK, INC. | No |
| 909-416 | SPOK, INC. | No |
| 909-540 | 33 WIRELESS INC. | No |
| 909-812 | AMERICAN MESSAGING SERVICES, LLC | No |
FAQ
What area code is Riverside, CA?
Riverside is served by 2 area codes — 909, 951 — which overlay the same territory.
How many prefixes does Riverside have?
155 active NXX prefixes are anchored to this rate center in NANPA records, held by 21 carriers.
Is a call from a Riverside prefix really from Riverside?
Not necessarily. The prefix marks where the number block was issued; porting, VoIP and spoofing all detach calls from that geography.