408 area code — San Jose:west Da, CA geographic

Data: NANPA public reports, current as of July 28, 2026.

If a call shows area code 408, the number was issued in the San Jose:west Da area — a code active since 1959, on Pacific time. Together with 669 it forms the 408/669 overlay. Because of number portability and VoIP, the area code tells you where the number was issued, not where the caller is right now.

NANPA lists 785 active NXX prefixes in 408, assigned to 28 carriers. 441 of those prefixes are pooled — shared between carriers in thousands-number blocks. The code spans 13 rate centers (billing localities).

Official projections put exhaust for the 408/669 complex at 1Q 2056.

Its parent code is 415, which it left in 1959. Later relief produced 831 (1998), 669 (2012) from its territory.

The dialing plan is 1+10D for home-NPA local calls and 1+10D across codes.

To check where a specific 408 number was issued, look up its six-digit prefix; to check who is actually calling, ignore the display and verify through an official callback number — caller ID is assertable and routinely spoofed.

Largest localities in 408

FAQ

Where is a 408 number from?

408 is assigned to San Jose:west Da and surrounding areas of California in the Pacific time zone. The three digits after the area code (the prefix) narrow it down to a rate center.

Is 408 a toll-free number?

No. 408 is a geographic code; calls are billed like any other domestic call. Toll-free codes are 800, 833, 844, 855, 866, 877 and 888.

Why do 669 and 408 cover the same place?

They are overlays: when a code runs low on numbers, a new code is added over the same territory instead of splitting it. The 408/669 complex shares one service area, and local calls are dialed with 10 digits.

Will 408 run out of numbers?

NANPA's current forecast projects exhaust in 1Q 2056 — decades of capacity remain.