Nicasio, CA — rate center
- State
- California
- Active prefixes
- 11
- Carriers
- 7
- Pooled prefixes
- 11
- LATA
- 722
- Metro area
- San Francisco-Oakland-Fremont, CA MSA
Phone numbers "from Nicasio" are, precisely speaking, numbers whose prefixes are anchored to the Nicasio rate center of California, under 415, 628.
NANPA records show 11 active prefixes here across 7 carriers. 11 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.
As always with US numbering: a prefix anchored to Nicasio tells you where the block was issued. The person calling may have ported the number, moved away, or be spoofing it entirely — verify callers through independently found contact details.
Prefixes anchored to Nicasio
| Prefix | Code holder | Pooled |
|---|---|---|
| 415-323 | BANDWIDTH.COM CLEC, LLC - CA | Yes |
| 415-598 | BANDWIDTH.COM CLEC, LLC - CA | Yes |
| 415-630 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Yes |
| 415-662 | PACIFIC BELL | Yes |
| 415-949 | BANDWIDTH.COM CLEC, LLC - CA | Yes |
| 415-997 | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | Yes |
FAQ
What area code is Nicasio, CA?
Nicasio is served by 2 area codes — 415, 628 — which overlay the same territory.
How many prefixes does Nicasio have?
11 active NXX prefixes are anchored to this rate center in NANPA records, held by 7 carriers.
Is a call from a Nicasio prefix really from Nicasio?
Not necessarily. The prefix marks where the number block was issued; porting, VoIP and spoofing all detach calls from that geography.