California · Pacific Time
408 Area Code
Area code 408 is in California, serving San Jose and most of Santa Clara County in Silicon Valley. It is in the Pacific Time zone. It shares its territory with overlay code 669, so 10-digit dialing is required.
Last updated October 1, 2026 · Source: NANPA
Where is the 408 area code?
408 is a California area code covering San Jose and most of Santa Clara County in Silicon Valley. In the wider directory it sits in the West region.
Cities in the 408 area code
- San Jose
- Sunnyvale
- Santa Clara
- Milpitas
- Cupertino
- Campbell
- Los Gatos
- Morgan Hill
- Gilroy
- Saratoga
- Monte Sereno
Counties served by 408
Santa Clara County.
408 overlay codes and dialing
The 408 territory is covered by an overlay of 2 area codes: 408, 669. All of them serve the same geographic area, and the original code is 408. Because more than one code covers the same ground, 10-digit dialing is mandatory — you must dial the area code for every local call. New phone lines may be assigned any of these codes.
History of the 408 area code
408 went into service on January 1, 1959, created when it was split from 415. It serves San Jose and the surrounding part of California, and today shares its territory with overlay code 669. For how codes are created, split, and overlaid, see how area codes work.
Is 408 a scam or spam risk?
408 is a legitimate geographic area code, not a premium or toll line, so a call from it costs you nothing extra. That said, scammers frequently spoof real local area codes to look familiar on caller ID. A genuine 408 number on your screen is no guarantee the caller is in San Jose, CA or trustworthy. See spam & scam-risk area codes for how spoofing works and how to respond.
Other California area codes
Explore more
See every code in California, compare codes across the West region, or view all Pacific Time codes. You can also browse the 4XX block or the complete numeric list of US area codes.
New to how this all works? Start with how area codes work, then read up on overlays, 10-digit dialing, and spam & scam-risk codes. To check another number, use the area code lookup tool.
Quick answers
408 area code FAQ
Where is the 408 area code?
The 408 area code is in California, covering San Jose and most of Santa Clara County in Silicon Valley, in the West region.
What cities are in the 408 area code?
Cities in the 408 area code include San Jose, Sunnyvale, Santa Clara, Milpitas, Cupertino, Campbell, Los Gatos, Morgan Hill, Gilroy and Saratoga.
What time zone is 408 in?
408 is in the Pacific Time zone.
What is the overlay for the 408 area code?
408 shares its territory with 669. Both codes (408, 669) serve the same area, so 10-digit dialing is required for every call.
When did the 408 area code start?
408 went into service on January 1, 1959.
Do I have to dial 10 digits for 408?
Yes. Because 408 is an overlay area, you must dial the full 10-digit number (area code + 7 digits) for every call.
Is 408 a toll-free or premium code?
No. 408 is a standard geographic area code, so calling it costs the same as any local or long-distance call on your plan. Toll-free calls use 800, 888, 877, 866, 855, 844 or 833.