San Francisco is served by the iconic 415 area code, joined in 2015 by the 628 overlay. Together they cover the city of San Francisco and Marin County across the Golden Gate Bridge. Because the two codes overlay the same area, 10-digit dialing is required for every local call.
Fast Facts: San Francisco Area Codes
| City | San Francisco, California |
| Primary Area Code(s) | 415 |
| Overlay Area Code(s) | 628 (2015) |
| Time Zone | Pacific Time (PT) – PST / PDT |
| Major Counties | San Francisco (and Marin) |
| Dialing | 10-digit required |
Area Codes in San Francisco – Detailed Breakdown
415 – San Francisco & Marin County
One of the original 1947 area codes, 415 is strongly identified with San Francisco and also covers Marin County to the north. It remains a prized, recognizable code.
628 – San Francisco overlay
Introduced in 2015 as an overlay of 415, the 628 code covers the same San Francisco and Marin region and appears mostly on newer numbers.
Neighborhoods & District Mapping
The 415 and 628 codes cover every San Francisco neighborhood, from Downtown, the Financial District, SoMa, and the Mission to the Marina, North Beach, Nob Hill, the Castro, Haight-Ashbury, the Sunset, and the Richmond. The same codes extend across the Golden Gate Bridge to Marin County communities such as Sausalito, Mill Valley, San Rafael, and Novato. The neighboring East Bay and Peninsula use separate codes (510/341 and 650).
San Francisco is the cultural and financial heart of Northern California and a global technology and finance center, home to companies from banking and biotech to a dense cluster of tech firms and startups. Its compact 47-square-mile footprint packs in a large population and an enormous number of businesses, which is why the historic 415 code needed the 628 overlay to keep up with demand for new numbers.
Local Dialing Rules & International Calls
Because 415 now shares an overlay with 628, 10-digit dialing is required for every local call in San Francisco and Marin. To call a San Francisco number from outside the United States, dial your country’s exit code, then +1 (the North American country code), then the 10-digit number (area code + seven-digit line number).
Major ZIP Codes in San Francisco
San Francisco ZIP codes run 94102–94188, covering neighborhoods from the Financial District (94104) and the Mission (94110) to the Sunset (94122) and the Richmond (94121).
Spam & Scam Call Warnings in San Francisco
Scammers often spoof local San Francisco numbers to seem trustworthy. Watch for these tactics reported across the area:
| Scam Type | What to Watch For |
|---|---|
| Utility Shut-off | Fake PG&E reps threatening to cut power unless you pay immediately – a scam that has repeatedly targeted Bay Area restaurants and small businesses. |
| Tech / Job Scam | Fake tech-company recruiter or remote-job offers seeking personal data or upfront fees. |
| Rental Scam | Fraudulent apartment listings demanding a deposit before you can view the unit – common in a tight housing market. |
| IRS / Tax Scam | Callers threatening arrest over supposed unpaid taxes, demanding gift cards or wire transfers. |
Red Flag: The IRS, Social Security Administration, and utilities like Pacific Gas and Electric (PG&E) will never demand immediate payment by gift card, wire transfer, or cryptocurrency. Hang up and verify using an official number.
↑ See the complete list of All US Area Codes by State – every area code across all 50 states in one directory.
Nearby California Cities
Frequently Asked Questions
What area codes does San Francisco use?
San Francisco uses the 415 area code and its 628 overlay, both covering the city and Marin County.
Do I have to dial 10 digits in San Francisco?
Yes. Because 415 shares an overlay with 628, you must dial the full 10-digit number for every local call.
Is a 415 number prestigious?
415 is the classic San Francisco code and is often seen as desirable; functionally it works the same as the 628 overlay.
Does 628 cover the same area as 415?
Yes. 628 is an overlay added in 2015 that covers the exact same San Francisco and Marin County region as 415.
Stay Safe & Explore More
- Verify an unknown caller in our Scam Alerts directory.
- Comparing nationwide numbers? See our Toll-Free Numbers guides.