The 415 area code is the signature telephone prefix of San Francisco and neighboring Marin County. As one of California’s original 1947 area codes, 415 is deeply tied to the identity of the Bay Area, from the tech-driven downtown to the scenic communities north of the Golden Gate Bridge. If you have received a call from a 415 number, here is a complete look at its location, dialing rules, and safety considerations.
Quick Summary: Area Code 415 at a Glance
| Detail | Information |
|---|---|
| Area Code | 415 |
| State | California (CA) |
| Major Cities | San Francisco, San Rafael, Novato, Sausalito |
| Time Zone | Pacific Time (PT) |
| Country Code | +1 (USA) |
| Overlay Codes | 628 |
Geographic Coverage & Major Cities
Area code 415 covers the city and county of San Francisco along with all of Marin County to the north. Once stretching across the entire Bay Area, 415 was gradually narrowed as the East Bay (510) and the Peninsula/South Bay were assigned their own codes.
Communities served by the 415 area code include:
- San Francisco — the Financial District, SoMa, Mission District, Nob Hill, and the Marina
- Southern Marin — Sausalito, Mill Valley, and Tiburon
- Central and northern Marin — San Rafael, Novato, Larkspur, and Corte Madera
As the home of countless technology companies and startups, a 415 number carries strong associations with San Francisco’s innovation economy, making it a prized business identifier.
A Brief History of Area Code 415
Area code 415 was one of the three original California area codes established in 1947, alongside 213 and 916. At first it blanketed a huge swath of the Bay Area, but rapid growth led to repeated splits: the East Bay moved to 510 in 1991, and the Peninsula and South Bay shifted to 650 in 1997, narrowing 415 to San Francisco and Marin County. In 2015, the 628 overlay was added across the same area, introducing mandatory 10-digit dialing while preserving the iconic 415 identity.
Time Zone & Best Time to Call
Numbers in the 415 area code follow Pacific Time (PT). The region observes Daylight Saving Time, moving from PST (UTC−8) in winter to PDT (UTC−7) in summer.
How to Dial Phone Numbers in Area Code 415
With the 628 overlay in place, the Bay Area requires 10-digit dialing.
Calling within the United States or Canada
- 10-digit dialing: Dial the full number — 415-XXX-XXXX.
- 11-digit dialing: You can also dial 1-415-XXX-XXXX using the NANP country code.
Calling from outside the United States
- Format: [exit code] + 1 + 415 + XXX + XXXX
- From Europe or most of Asia: 00 1 415 XXX XXXX
- From any mobile phone: +1 415 XXX XXXX
Is Area Code 415 a Scam? Safety & Protection Tips
Area code 415 is a legitimate San Francisco and Marin County area code, so an incoming 415 call is not automatically fraudulent. However, scammers often spoof the code to make robocalls and fraud attempts look like they come from a trusted Bay Area source. Neighbor spoofing, which mirrors your own number’s prefix, is a widespread technique.
Common scam tactics linked to this region
| Scam type | What to watch for |
|---|---|
| Tech-company impersonation | Fake “account security” or crypto-investment pitches |
| Government impersonation | Callers posing as the SSA or IRS threatening legal action |
| Package-delivery phishing | Texts or calls about a “held” delivery needing a fee |
| Charity fraud | High-pressure requests for donations after local events |
How to report, block, and look up 415 callers
- Withhold personal and financial details from any unexpected caller.
- Block the number using your device’s tools or a call-screening app.
- Research the number with a trusted reverse phone lookup first.
- Report the call to the FTC at reportfraud.ftc.gov and sign up at DoNotCall.gov.
Nearby & Related Area Codes in California
Area code 415 is part of a tightly connected group of Bay Area codes:
- 628 — the overlay covering the same San Francisco and Marin territory
- 650 — the Peninsula and northern San Mateo County
- 510 & 341 — Oakland and the East Bay
- 925 (Contra Costa) and 408 (San Jose/Silicon Valley)
Heading south to Los Angeles? Read our guide to the 310 area code. Explore the full California area codes hub or our complete US area codes directory.
↑ See the complete list of All US Area Codes by State – every area code across all 50 states in one directory.
Explore Neighboring States
Researching area codes just across the state line? Start with these codes in the states that border California:
Frequently Asked Questions About Area Code 415
Where is the 415 area code located?
Area code 415 covers the city of San Francisco and all of Marin County, including San Rafael, Novato, and Sausalito. It operates on Pacific Time and shares its territory with the 628 overlay.
Is 415 a landline or cell phone area code?
Both. Area code 415 is used for landlines, mobile phones, and VoIP services across San Francisco and Marin. Thanks to the 628 overlay, every local call requires 10-digit dialing.
Why is a 415 number popular with businesses?
415 is closely tied to San Francisco’s technology and startup culture, so a 415 number signals a genuine Bay Area presence. This makes it especially desirable for tech firms, agencies, and professional services.
Should I answer a call from an unknown 415 number?
If the call is unexpected, let it go to voicemail. Legitimate callers will leave a message, whereas spoofed and automated numbers rarely do. Check any unfamiliar number with a reverse lookup before calling back.
Related 415 Guides
- Is a 415 call safe? Read Is area code 415 a scam? Spam & safety guide.
- Local coverage: see the San Francisco area code guide.
- Worried about spam or robocalls? Browse our Scam Alerts directory.