California · Pacific Time
415 Area Code
Area code 415 is in California, serving San Francisco and Marin County north of the Golden Gate. It is in the Pacific Time zone. It shares its territory with overlay code 628, so 10-digit dialing is required.
Last updated October 1, 2026 · Source: NANPA
Where is the 415 area code?
415 is a California area code covering San Francisco and Marin County north of the Golden Gate. In the wider directory it sits in the West region.
Cities in the 415 area code
- San Francisco
- San Rafael
- Novato
- Mill Valley
- Sausalito
- Larkspur
- Tiburon
- Corte Madera
- San Anselmo
- Fairfax
- Belvedere
Counties served by 415
San Francisco County and Marin County.
415 overlay codes and dialing
The 415 territory is covered by an overlay of 2 area codes: 415, 628. All of them serve the same geographic area, and the original code is 415. 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 415 area code
415 is one of the original area codes assigned in 1947, when AT&T and Bell Laboratories created the North American Numbering Plan and divided the country into the first 86 numbering plan areas. It has served the San Francisco area ever since, with 628 later added as an overlay to supply more numbers.
Is 415 a scam or spam risk?
415 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 415 number on your screen is no guarantee the caller is in San Francisco, 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
415 area code FAQ
Where is the 415 area code?
The 415 area code is in California, covering San Francisco and Marin County north of the Golden Gate, in the West region.
What cities are in the 415 area code?
Cities in the 415 area code include San Francisco, San Rafael, Novato, Mill Valley, Sausalito, Larkspur, Tiburon, Corte Madera, San Anselmo and Fairfax.
What time zone is 415 in?
415 is in the Pacific Time zone.
What is the overlay for the 415 area code?
415 shares its territory with 628. Both codes (415, 628) serve the same area, so 10-digit dialing is required for every call.
When did the 415 area code start?
415 went into service on January 1, 1947 as one of the original 1947 North American area codes.
Do I have to dial 10 digits for 415?
Yes. Because 415 is an overlay area, you must dial the full 10-digit number (area code + 7 digits) for every call.
Is 415 a toll-free or premium code?
No. 415 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.