San Jose:north Da, CA — rate center

NANPA rate center & CO code data, current as of July 28, 2026.

The San Jose:north Da rate center (California) anchors 174 active prefixes under area codes 408, 669. Rate centers, not city limits, are what phone numbers are legally tied to.

NANPA records show 174 active prefixes here across 21 carriers. 112 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 (408/669) is the overlay pattern: same geography, different first three digits.

At 174 prefixes — a ceiling of 1,740,000 numbers — San Jose:north Da is one of California's heavyweight rate centers.

As always with US numbering: a prefix anchored to San Jose:north Da 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 San Jose:north Da

FAQ

What area code is San Jose:north Da, CA?

San Jose:north Da is served by 2 area codes — 408, 669 — which overlay the same territory.

How many prefixes does San Jose:north Da have?

174 active NXX prefixes are anchored to this rate center in NANPA records, held by 21 carriers.

Is a call from a San Jose:north Da prefix really from San Jose:north Da?

Not necessarily. The prefix marks where the number block was issued; porting, VoIP and spoofing all detach calls from that geography.