California · Pacific Time
San Jose, CA Area Codes
San Jose is served by 2 area codes (408, 669). Here's which is original, which are overlays, and how to pick one for a new local number.
Last updated June 5, 2026
Area codes serving San Jose
San Jose sits in California, part of the West region and the Pacific Time zone. Its numbers are spread across an overlay of 2 codes that all cover the same ground: 408, 669.
The original code is 408. As the area ran low on numbers, regulators added overlay codes on top instead of splitting the city, so longtime residents kept their numbers while new lines received a newer code.
How to pick an area code for a new number
When you activate a new line in San Jose, the carrier assigns whichever code has numbers available — you usually can't choose. If a specific code matters to you (for example the prestige of 408), ask the carrier whether any blocks remain, or request a number transfer. All codes here dial identically and cost the same.
Dialing in San Jose
Because San Jose is an overlay area, 10-digit dialing is mandatory: always dial the area code plus the seven-digit number, even for a neighbor. See 10-digit dialing and overlay area codes for the background. For every code in California, visit the California area codes page.
Quick answers
San Jose area code FAQ
What area codes does San Jose use?
San Jose, CA is served by 2 area codes: 408, 669.
Which is the original San Jose area code?
408 is the original/primary code for San Jose; the others are overlays added later for more numbers.
Do I need to dial the area code in San Jose?
Yes. With multiple overlapping codes, 10-digit dialing is required for every call in this area.