California · Pacific Time
San Francisco, CA Area Codes
San Francisco is served by 2 area codes (415, 628). 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 Francisco
San Francisco 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: 415, 628.
The original code is 415. 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 Francisco, 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 415), ask the carrier whether any blocks remain, or request a number transfer. All codes here dial identically and cost the same.
Dialing in San Francisco
Because San Francisco 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 Francisco area code FAQ
What area codes does San Francisco use?
San Francisco, CA is served by 2 area codes: 415, 628.
Which is the original San Francisco area code?
415 is the original/primary code for San Francisco; the others are overlays added later for more numbers.
Do I need to dial the area code in San Francisco?
Yes. With multiple overlapping codes, 10-digit dialing is required for every call in this area.