Prefix 909-378 — Diamond Bar, CA
- Area code
- 909
- Prefix (NXX)
- 378
- Rate center
- Diamond Bar
- State
- California
- Time zone
- Pacific
- Code holder
- MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA
- OCN
- 7240
- Pooled
- Yes (thousands-block pooling)
- Assigned
- 2013-07-31
- LATA
- 730
Numbers in the 909-378 prefix are registered to the Diamond Bar rate center in CA, inside area code 909. The prefix is the second block of a ten-digit US number (909-378-XXXX) and pins the number to a billing locality.
Code-holder of record: MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA (OCN 7240), assigned July 31, 2013. The prefix is pooled: its ten thousands-blocks can be shared among several carriers, so different 909-378 numbers may be served by different companies.
The rate center lies in the Los Angeles-Long Beach-Anaheim, CA Metropolitan Statistical Area. The serving LATA is 730. Local time follows the Pacific zone.
Spoofing means this prefix on your screen doesn't guarantee a Diamond Bar caller. Verify independently before trusting a request for money or data.
Neighboring prefixes
| Prefix | Rate center | Code holder |
|---|---|---|
| 909-375 | Big Bear City | BANDWIDTH.COM CLEC, LLC - CA |
| 909-376 | Ontario | T-MOBILE USA, INC. |
| 909-377 | Upland | NEW CINGULAR WIRELESS PCS, LLC |
| 909-379 | San Bernardino | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA |
| 909-380 | San Bernardino | FRONTIER CALIFORNIA INC. |
| 909-381 | San Bernardino | FRONTIER CALIFORNIA INC. |
FAQ
Where is 909-378 located?
The prefix is assigned to the Diamond Bar rate center in CA, area code 909. It is part of the Los Angeles-Long Beach-Anaheim, CA Metropolitan Statistical Area.
Which company owns 909-378 numbers?
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA holds the code, but the prefix is pooled — individual thousands-blocks can be assigned to other carriers, and numbers may be ported to any provider.
Is a call from 909-378 safe to answer?
The prefix itself says nothing about the caller. Legitimate Diamond Bar businesses and spoofed robocalls can both display it. Never share personal data with an unverified inbound caller.