Corte Madera, CA — rate center
- State
- California
- Active prefixes
- 20
- Carriers
- 11
- Pooled prefixes
- 17
- LATA
- 722
- Metro area
- San Francisco-Oakland-Fremont, CA MSA
Phone numbers "from Corte Madera" are, precisely speaking, numbers whose prefixes are anchored to the Corte Madera rate center of California, under 415, 628.
The rate center currently carries 20 working prefixes across 11 carriers. 17 prefixes participate in thousands-block pooling, so blocks of 1,000 numbers are shared between carriers.
The rate center belongs to the San Francisco-Oakland-Fremont, CA Metropolitan Statistical Area. Routing-wise it sits in LATA 722.
Multiple area codes over one rate center (415/628) is the overlay pattern: same geography, different first three digits.
A Corte Madera 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 Corte Madera
| Prefix | Code holder | Pooled |
|---|---|---|
| 415-329 | ONVOY, LLC - CA | Yes |
| 415-413 | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | Yes |
| 415-496 | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | Yes |
| 415-548 | ONVOY, LLC - CA | Yes |
| 415-737 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Yes |
| 415-758 | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | Yes |
| 415-849 | BANDWIDTH.COM CLEC, LLC - CA | Yes |
| 415-886 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Yes |
| 415-891 | COMCAST PHONE OF CALIFORNIA, LLC | Yes |
| 415-924 | PACIFIC BELL | No |
| 415-927 | PACIFIC BELL | No |
| 415-936 | NEW CINGULAR WIRELESS PCS, LLC | Yes |
| 415-945 | PACIFIC BELL | No |
FAQ
What area code is Corte Madera, CA?
Corte Madera is served by 2 area codes — 415, 628 — which overlay the same territory.
How many prefixes does Corte Madera have?
20 active NXX prefixes are anchored to this rate center in NANPA records, held by 11 carriers.
Is a call from a Corte Madera prefix really from Corte Madera?
Not necessarily. The prefix marks where the number block was issued; porting, VoIP and spoofing all detach calls from that geography.