San Jose:south Da, CA — rate center

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

The San Jose:south Da rate center (California) anchors 116 active prefixes under area codes 408, 669. Rate centers, not city limits, are what phone numbers are legally tied to.

116 central-office prefixes are currently anchored to this rate center across 23 carriers. 86 prefixes participate in thousands-block pooling, so blocks of 1,000 numbers are shared between carriers.

The rate center belongs to the San Jose-Sunnyvale-Santa Clara, 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 116 prefixes — a ceiling of 1,160,000 numbers — San Jose:south Da is one of California's heavyweight rate centers.

Treat this data as geography of the number, not of the caller: porting, VoIP and caller-ID spoofing all detach the two. When a call matters, hang up and call back through an official number.

Prefixes anchored to San Jose:south Da

FAQ

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

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

How many prefixes does San Jose:south Da have?

116 active NXX prefixes are anchored to this rate center in NANPA records, held by 23 carriers.

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

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