Prefix 408-637 — Campbell, CA
408-637 identifies a block of numbers in Campbell, CA, within the 408 area code. Every US prefix is tied to exactly one rate center; this one is Campbell.
The rate center lies in the San Jose-Sunnyvale-Santa Clara, CA Metropolitan Statistical Area. The serving LATA is 722. Local time follows the Pacific zone.
Treat the on-screen number as a hint, not evidence — 408-637 can be spoofed like any US prefix. If a call feels off, verify through an official callback number and file a complaint with the FCC or FTC.
NANPA's central-office code records list U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS (OCN 671J) as the code holder, assigned February 22, 2010. Because 408-637 participates in thousands-block pooling, individual 1,000-number blocks may belong to other carriers than the code holder.
Neighboring prefixes
| Prefix | Rate center | Code holder |
|---|---|---|
| 408-634 | San Martin | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA |
| 408-635 | San Jose:north Da | PACIFIC BELL |
| 408-636 | Sunnyvale | MCIMETRO ACCESS TRANSMISSION SERVICES LLC |
| 408-638 | San Jose:west Da | METROPCS, INC. |
| 408-639 | San Jose:west Da | T-MOBILE USA, INC. |
| 408-640 | San Jose:west Da | METROPCS, INC. |
FAQ
Where is 408-637 located?
The prefix is assigned to the Campbell rate center in CA, area code 408. It is part of the San Jose-Sunnyvale-Santa Clara, CA Metropolitan Statistical Area.
Which company owns 408-637 numbers?
U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 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 408-637 safe to answer?
The prefix itself says nothing about the caller. Legitimate Campbell businesses and spoofed robocalls can both display it. Never share personal data with an unverified inbound caller.