Area Code for San Francisco

San Francisco’s primary area code is 415, one of the original 86 North American codes assigned in 1947.

A second code, 628, was overlaid onto the same geography in March 2015 by the California Public Utilities Commission (CPUC) when the 415 supply of available number combinations ran low.

Together, 415 and 628 serve San Francisco city and county, most of Marin County, and a narrow strip of San Mateo County. The wider Bay Area adds five more codes: 510 (East Bay/Oakland), 341 (510 overlay), 650 (Peninsula), 408 (South Bay/San Jose), 669 (408 overlay), and 707 (Marin’s Wine Country neighbors north through Eureka).

What’s the area code for San Francisco?

San Francisco uses two active area codes that cover the same territory.

Code	Established	Type	Coverage
415	1947	Original	SF city & county, Marin County, parts of San Mateo County
628	March 21, 2015	Overlay	Same geographic territory as 415

Both codes are local to each other — a call from a 415 number to a 628 number is a local call, not long distance.

Since the 628 overlay launched, all calls within the zone require 10-digit dialing (area code + 7-digit number). Emergency services (911) and N11 codes (211, 311, 411) remain three digits.

The overlay decision was approved by the CPUC as Decision 13-12-055 on December 14, 2014, effective March 21, 2015. Existing 415 customers kept their numbers unchanged; only new number assignments began drawing from the 628 pool.

Bay Area codes by region

The San Francisco Bay Area is one of the most area-code-dense metro regions in the US. Each sub-region has its own code — and most now have overlays.

San Francisco city (415 / 628)

The City and County of San Francisco is entirely within the 415/628 zone. All SF neighborhoods — SoMa, the Mission, Pacific Heights, Tenderloin, Financial District, Castro, Sunset, Richmond — fall under these two codes.

The zone also includes Marin County directly north across the Golden Gate Bridge: San Rafael, Novato, Mill Valley, Sausalito, Tiburon, Corte Madera, Larkspur, Fairfax, and smaller towns.

South of the city, Brisbane and Daly City carry 415/628 despite being in San Mateo County.

East Bay (510 / 341)

Area code 510 covers Oakland, Berkeley, Fremont, Hayward, Alameda, Richmond, and most of the East Bay corridor along Interstate 80.

341 is the 510 overlay, active since 2021. Calls between 510 and 341 are local.

Peninsula (650)

Area code 650 covers San Mateo County from South San Francisco down through Palo Alto, Menlo Park, Redwood City, and San Mateo itself. Stanford University carries a 650 number.

Daly City is a notable exception — it borders San Mateo County but falls inside the 415/628 zone.

South Bay / San Jose (408 / 669)

Area code 408 covers San Jose, Santa Clara, Sunnyvale, Mountain View, Cupertino, and the South Bay. This is the heart of Silicon Valley.

669 is the 408 overlay, launched in 2012. Together they serve roughly 3 million residents in Santa Clara County.

North Bay / Wine Country (707)

Area code 707 begins at the northern edge of Marin County and extends through Sonoma, Napa, Mendocino, and Humboldt counties to Eureka. Key cities: Santa Rosa, Petaluma, Napa, and Vallejo.

History of SF area codes

The 415 code has one of the longest histories of any US area code still in active use.

1947 — 415 assigned. AT&T and the Bell System partitioned the entire US into 86 numbering plan areas. California received three codes: 213 (Southern CA), 916 (Sacramento and Central Valley), and 415 (Northern California — at the time covering from San Francisco north to the Oregon border and south to Bakersfield).

1959 — First split. A three-way reconfiguration created area code 707 for the North Bay and Wine Country, and area code 408 for Santa Clara County and the South Bay. The 415 zone shrank to the Bay Area core.

1991 — East Bay splits to 510. Population growth and fax machines exhausted 415 number supply in the East Bay. On September 2, 1991, 510 was carved out for Oakland, Berkeley, Fremont, and the Alameda County corridor.

1997 — Peninsula splits to 650. On August 2, 1997, the Peninsula and most of San Mateo County moved to 650, further shrinking the 415 zone to SF city and Marin County.

2015 — 628 overlay. Rather than splitting the remaining 415 territory (which would have forced existing SF customers to change numbers), the CPUC chose an overlay approach. On March 21, 2015, 628 began serving the same geography as 415. This was California’s first overlay applied to an area that had already been split multiple times.

Sources: NANPA, CPUC Decision 13-12-055, FCC.

415 as a tech industry signal

No area code in the US carries the same cultural weight as 415 for the technology industry.

The code predates Silicon Valley as a concept. When 415 was assigned in 1947, it covered all of Northern California. By the time the first wave of SF tech companies formed in the 1980s, a 415 number was simply what San Francisco looked like — it was not a choice, it was geography.

As the Bay Area’s codes multiplied (408, 510, 650), the 415 zone shrank to the city proper. This meant that by 2000, a 415 prefix specifically signaled San Francisco — not the suburbs, not the Peninsula, not the South Bay. The distinction mattered in a business culture where “SF vs. SoMa vs. South Bay” carried social meaning.

Venture capital firms on Sansome Street and Montgomery Street kept 415 numbers. Early employees at Twitter, Airbnb, Uber, and Salesforce had 415 desk phones. The code became a credential.

This effect persists for businesses acquiring virtual numbers today. A 415 number signals “SF establishment” in a way a 628 number — technically identical in routing — does not yet replicate. Companies targeting SF enterprise customers, Bay Area recruiting, or local professional services frequently request 415 specifically for this reason.

DialPhone provisions 415 numbers with STIR/SHAKEN A-attestation — full verification that the calling party is authorized to use the number. This matters because the cultural cache of 415 also attracts spoofers, and A-attestation ensures your legitimate 415 calls are not filtered alongside robocall fraud.

SF area code spam and scams

The 415 and 628 codes are among the most spoofed in California. Several fraud patterns target SF area recipients specifically.

Tech recruiter fraud. Callers impersonate recruiters from well-known SF tech companies (Google, Salesforce, OpenAI, Stripe). They offer phantom roles to extract personal data or wire transfer “background check fees.”

IRS / government impersonation. Calls claiming to be from the IRS, Social Security Administration, or USCIS with urgent tax debt or immigration violation threats. The FCC notes these remain the highest-volume phone fraud category nationwide.

Fake delivery notifications (USPS/FedEx/Amazon). Calls or texts about a “failed delivery” requiring fee payment or personal confirmation. In SF, elevated package delivery volume makes this plausible to recipients.

Crypto investment fraud. Callers claim to represent SF-based investment firms offering Bitcoin or alternative asset opportunities. These escalate to “pig butchering” schemes — long-term relationship building before a large fraudulent investment request.

How STIR/SHAKEN reduces this risk. The FCC mandated STIR/SHAKEN authentication across US carriers starting in 2021. A-attestation (the highest level) means the originating carrier has verified the caller is authorized to use the number. When you call from a DialPhone 415 or 628 number with A-attestation, recipients see “Verified Call” instead of “Potential Spam” on supporting devices.

If you receive a suspicious 415 or 628 call, report it to the FCC Consumer Complaint Center.

How to get an SF business phone number

Getting a San Francisco 415 or 628 number does not require a physical SF address or office lease. VoIP providers provision virtual numbers through the national DID pool.

Step 1 — Choose your area code. 415 carries legacy prestige; 628 has broader availability. Both are local to SF recipients and carry identical call routing.

Step 2 — Select a DialPhone plan. Review options at DialPhone pricing. All plans include local DID numbers. Enterprise plans include number porting if you are moving an existing SF number from another carrier.

Step 3 — Claim your number. Search the available 415 and 628 inventory during signup. Pick your preferred prefix combination.

Step 4 — Configure routing. Set call forwarding, IVR menus, voicemail, and the AI receptionist to handle after-hours or overflow calls.

Step 5 — Start receiving calls. Your DialPhone 415 or 628 number is live immediately. Porting an existing SF number takes 2–4 business days — see the number porting guide for the exact paperwork and timeline.

See DialPhone business phone for full feature detail and start a free trial.

Famous companies with SF area code numbers

San Francisco’s 415 zone hosts the headquarters of some of the most recognized companies in US business history. These organizations give the 415 code its commercial gravity.

Salesforce (HQ: 415) — the world’s largest CRM company, headquartered at Salesforce Tower in the Financial District, has used a 415 number since its 1999 founding.

Wells Fargo (HQ: 415) — one of the four largest US banks, founded in San Francisco in 1852, maintains its global headquarters at 420 Montgomery Street with 415 numbers.

Twitter / X (415) — originally founded in SoMa, Twitter’s original offices and primary contact numbers carried 415 prefixes.

Uber Technologies (HQ: 415) — founded in San Francisco in 2009, Uber’s Mission Bay headquarters holds 415 numbers.

Airbnb (HQ: 415) — founded in 2008 in San Francisco, Airbnb operates from Brannan Street in SoMa under a 415 main line.

Levi Strauss & Co. (HQ: 415) — the 170-year-old denim company has headquartered at Levi’s Plaza in North Beach since 1982, maintaining 415 presence from before the tech era.

Gap Inc. (HQ: 415) — the retail group behind Gap, Old Navy, and Banana Republic is headquartered in San Francisco with 415 main lines.

These names represent the full span of SF commercial history — from Gold Rush–era banking to 21st-century platform companies — all unified by the same three digits.

For businesses in California targeting enterprise clients in SF, sharing an area code with these companies is a non-trivial credibility signal.

San Francisco area code FAQ

San Francisco area code FAQ

What is the area code for San Francisco? +

San Francisco uses two area codes: 415 and 628.

415 is the original code, established in 1947 as one of the 86 founding North American area codes. 628 is an overlay — it was added in 2015 by the California Public Utilities Commission (CPUC) when 415 ran low on available number combinations. Both codes serve exactly the same geography: the City and County of San Francisco, most of Marin County, and a small slice of San Mateo County including Daly City and Brisbane.

Is 628 a San Francisco area code? +

Yes. 628 is a full San Francisco area code covering the same geographic territory as 415.

The CPUC approved the 628 overlay in Decision 13-12-055 (December 14, 2014), and it became active on March 21, 2015. Any new phone number assigned in the SF-Marin zone after that date may carry either a 415 or 628 prefix. Calls between the two codes are local — no long-distance charge applies.

What other area codes are in the Bay Area? +

The Bay Area uses seven area codes across its sub-regions.

415 and 628 cover San Francisco city and Marin County. 510 and 341 (overlay) cover Oakland, Berkeley, and the East Bay. 650 covers the Peninsula (San Mateo County south to Palo Alto). 408 and 669 (overlay) cover San Jose and the South Bay. 707 covers Marin's northern neighbor Sonoma County, Napa, and stretches to Eureka.

Do I need to dial 10 digits for San Francisco calls? +

Yes. Since the 628 overlay launched in 2015, all calls within the 415/628 zone require 10-digit dialing: area code + 7-digit number.

Before the overlay, local SF-to-SF calls within 415 only needed 7 digits. After the overlay, the same local call requires 415-XXX-XXXX or 628-XXX-XXXX. This does not create a long-distance charge — only the dialing format changed. Emergency services (911) and N11 codes (211, 311, 411) still use three digits.

Why is the 415 area code prestigious? +

415 carries cultural weight in San Francisco because it predates Silicon Valley and modern tech culture by decades.

Assigned in 1947, the code originally covered all of Northern California. As tech boomed in the 1980s and 1990s, a 415 number became shorthand for 'SF native' versus 'transplant.' Venture capital firms, early-stage founders, and established companies like Salesforce and Wells Fargo all hold 415 numbers. That identity signal persists today, which is why businesses acquiring virtual phone numbers often choose 415 over the newer 628 when both are available.

How can I get a San Francisco 415 or 628 phone number? +

You can get a 415 or 628 virtual phone number from a VoIP provider without a physical San Francisco address.

DialPhone provisions 415 and 628 numbers with STIR/SHAKEN A-attestation, meaning the calls show as fully verified on recipient caller ID screens — important in a market flooded with robocall spoofing. Setup takes minutes. See the DialPhone free trial at /pricing/free-trial to claim a number.

What area code is Oakland? +

Oakland and most of the East Bay use area code 510, created on September 2, 1991, when it split from the original 415 territory.

A 510 overlay code, 341, became effective in 2021 to handle number exhaustion in the East Bay. Cities in the 510/341 zone include Oakland, Berkeley, Fremont, Hayward, Alameda, and Richmond. See the full Oakland coverage page at /area-codes/510.

Is a 415 number still available? +

Yes, but supply is tighter than for 628 numbers.

415 has been assigned since 1947 and the available prefix combinations are limited. VoIP providers including DialPhone source 415 DIDs from the national number pool — availability varies by prefix. If a specific 415 prefix is unavailable, 628 is a functionally identical alternative with identical local call routing and trust attestation.

Get a San Francisco business number

Whether you are establishing a local presence for a Bay Area sales team, porting an existing SF number to a modern VoIP platform, or setting up an AI receptionist to answer 415 calls around the clock — DialPhone provisions both 415 and 628 numbers with A-attestation verification.

• Start a free trial — claim your 415 or 628 number
• View all DialPhone plans and pricing
• Business phone features overview
• AI receptionist for after-hours SF calls
• Number porting guide — move your existing SF number

Related area code pages: 415 · 510 Oakland · 408 San Jose · California area codes