WHAT YOU NEED TO KNOW
Area code 415 serves San Francisco and Marin County in California, covering cities including San Francisco, San Rafael, Novato, and Sausalito. One of the original 86 NANP codes established in 1947, it now covers approximately 1.1 million residents after several splits reduced its footprint over the decades. It is the primary local code for San Francisco proper.
- Population: approximately 1.1 million residents across San Francisco and Marin County
- Overlay: Overlay: 628 (added 2015)
- Dialing: 10-digit dialing required
- Source Type: Local geographic code
Geographic Coverage
Area code 415 covers two main geographic areas: the city and county of San Francisco, and Marin County to the north across the Golden Gate Bridge. Marin County cities served include San Rafael, Novato, Mill Valley, Sausalito, Corte Madera, Fairfax, Tiburon, Belvedere, Larkspur, San Anselmo, and Kentfield, as well as smaller communities such as Stinson Beach, Bolinas, and Point Reyes Station. The code does not extend into the East Bay or Peninsula.
Population and Business Context
San Francisco is one of the most economically dense cities in the United States, anchoring a technology, finance, and professional services hub. The city proper has roughly 875,000 residents and serves as headquarters for major financial institutions and tech companies. Marin County adds approximately 260,000 residents and is known for high household incomes and professional demographics. Businesses operating in 415 territory reach a high-value consumer and B2B market.
Area Code History
Area code 415 was one of the original area codes assigned when the North American Numbering Plan launched in 1947. At that time it covered the entire northern half of California. A 1984 split created area code 916 for the Sacramento region, and a 1991 split established area code 510 for the East Bay. The 408 split in 1995 further reduced 415 coverage, leaving it with San Francisco and Marin County only. An overlay code, 628, was added in 2015 to address number exhaustion.
How to Dial
Callers within the 415 and 628 overlay region must dial all 10 digits (area code plus 7-digit number) for every local call. This 10-digit requirement applies to calls between 415 and 628 numbers, since both codes serve the same geographic area. Long-distance calls to numbers outside this area require dialing 1 plus the full 10-digit number. Callers from outside the region should dial 1-415 followed by the 7-digit local number.
Need a 415 Number for Your San Francisco Business?
Businesses operating in San Francisco and Marin County can provision a local 415 tracking number through Convirza. A 415 prefix signals local presence to customers in one of the most competitive urban markets in the country. Convirza provisions trackable local numbers in any North American area code, making it straightforward to establish or expand a local footprint without changing your existing routing setup. Every call to your 415 number is automatically scored, recorded, and source-attributed using dynamic number insertion (DNI), so you know exactly which campaigns, channels, or keywords are driving inbound calls. Calls can be routed to any team member, office, or location in real time. This gives San Francisco and Marin County businesses a clear picture of call quality and marketing ROI without manual tracking.
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