Claremont, CA — rate center
- State
- California
- Active prefixes
- 57
- Carriers
- 15
- Pooled prefixes
- 39
- LATA
- 730
- Metro area
- Los Angeles-Long Beach-Anaheim, CA MSA
In NANP numbering, Claremont, California is a rate center — the anchor point for local numbers. It is reached through 840, 909 (multiple area codes serve it).
The rate center currently carries 57 working prefixes, held by 15 different carriers. Pooling applies to 39 of them — individual thousands-blocks may belong to different companies.
The rate center belongs to the Los Angeles-Long Beach-Anaheim, CA Metropolitan Statistical Area. Routing-wise it sits in LATA 730.
Because 840, 909 all serve this territory, two Claremont numbers can look completely different while being neighbors — check the prefix, not just the area code.
A Claremont 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 Claremont
| Prefix | Code holder | Pooled |
|---|---|---|
| 909-207 | SPOK, INC. | No |
| 909-267 | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | Yes |
| 909-288 | ONVOY, LLC - CA | Yes |
| 909-293 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Yes |
| 909-305 | FRONTIER CALIFORNIA INC. | Yes |
| 909-344 | T-MOBILE USA, INC. | Yes |
| 909-392 | FRONTIER CALIFORNIA INC. | No |
| 909-394 | FRONTIER CALIFORNIA INC. | No |
| 909-398 | FRONTIER CALIFORNIA INC. | No |
| 909-399 | FRONTIER CALIFORNIA INC. | No |
| 909-407 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | Yes |
| 909-445 | FRONTIER CALIFORNIA INC. | Yes |
| 909-447 | FRONTIER CALIFORNIA INC. | Yes |
| 909-448 | FRONTIER CALIFORNIA INC. | No |
| 909-450 | PACIFIC BELL (COMPETITIVE) | Yes |
| 909-451 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | Yes |
| 909-480 | FRONTIER CALIFORNIA INC. | Yes |
| 909-482 | FRONTIER CALIFORNIA INC. | No |
| 909-506 | T-MOBILE USA, INC. | Yes |
| 909-523 | SPOK, INC. | No |
| 909-526 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | Yes |
| 909-541 | T-MOBILE USA, INC. | Yes |
| 909-542 | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | Yes |
| 909-568 | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | Yes |
| 909-575 | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | Yes |
| 909-592 | FRONTIER CALIFORNIA INC. | No |
| 909-593 | FRONTIER CALIFORNIA INC. | No |
| 909-596 | FRONTIER CALIFORNIA INC. | No |
| 909-599 | FRONTIER CALIFORNIA INC. | No |
| 909-603 | FRONTIER CALIFORNIA INC. | No |
| 909-607 | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | No |
| 909-621 | FRONTIER CALIFORNIA INC. | No |
| 909-624 | FRONTIER CALIFORNIA INC. | No |
| 909-625 | FRONTIER CALIFORNIA INC. | No |
| 909-626 | FRONTIER CALIFORNIA INC. | No |
| 909-656 | T-MOBILE USA, INC. | Yes |
| 909-667 | ONVOY, LLC - CA | Yes |
| 909-670 | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | Yes |
| 909-675 | ONVOY, LLC - CA | Yes |
| 909-741 | T-MOBILE USA, INC. | Yes |
| 909-753 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Yes |
| 909-788 | FRACTEL, LLC | Yes |
| 909-830 | VONAGE AMERICA LLC | Yes |
| 909-833 | BANDWIDTH.COM CLEC, LLC - CA | Yes |
| 909-901 | BANDWIDTH.COM CLEC, LLC - CA | Yes |
| 909-905 | T-MOBILE USA, INC. | Yes |
| 909-929 | TWC IP ENABLED SERVICES, LLC | Yes |
| 909-962 | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | Yes |
| 909-964 | T-MOBILE USA, INC. | Yes |
| 909-971 | FRONTIER CALIFORNIA INC. | Yes |
FAQ
What area code is Claremont, CA?
Claremont is served by 2 area codes — 840, 909 — which overlay the same territory.
How many prefixes does Claremont have?
57 active NXX prefixes are anchored to this rate center in NANPA records, held by 15 carriers.
Is a call from a Claremont prefix really from Claremont?
Not necessarily. The prefix marks where the number block was issued; porting, VoIP and spoofing all detach calls from that geography.