Where Is Area Code 415 Located?

Area code 415 covers San Francisco and surrounding areas in California. It is one of the original 86 area codes established by AT&T in 1947. Today it shares its territory with overlay code 628. For the full picture, see all California area codes.

History of Area Code 415

Area code 415 is one of the 86 original area codes created by AT&T in 1947, when the first nationwide numbering plan went into effect on January 1 of that year. It was assigned to California as part of the initial map that divided the United States and Canada into geographic dialing regions.

Since its activation, the geographic area covered by 415 has been reshaped by the following splits:

• 1959 — area code 408 split off to cover the South Bay (San Jose and Santa Clara County) — before the area was Silicon Valley
• 1991 — area code 510 split off to cover the East Bay — Oakland, Berkeley, and Alameda and Contra Costa counties
• 1997 — area code 650 split off to cover the San Francisco Peninsula (San Mateo County south of San Francisco), on August 2, 1997

Overlay codes have been added to the same geographic territory in:

• 2015 — area code 628 activated as an overlay

Cities and Areas Served by 415

Area code 415 serves the City and County of San Francisco, most of Marin County, and the northeast corner of San Mateo County, including the following cities and communities:

• San Francisco
• San Rafael
• Mill Valley
• Sausalito
• Tiburon
• Novato
• Larkspur
• Corte Madera
• Daly City (part)
• Brisbane (part)

Nearby area codes covering the same broader region include: 628, 510, 650, 408, 707, 925.

Overlay Codes 415

Area code 628 shares the same geographic territory as 415 (added in 2015). New phone numbers in the region may be assigned either code.

Because multiple area codes serve the same area, ten-digit dialing is mandatory for all local calls. A call from any of these codes originates from the same geographic region in California.

The Cultural Weight of a 415 Number

Area code 415 was one of the three original California codes assigned in October 1947 by AT&T at the rollout of nationwide direct distance dialing. Originally it covered central California: south of 916 (the northern third) and north of 213 (the southern half), stretching from Sacramento in the north all the way to Bakersfield. Three splits over four decades narrowed it to its current footprint. The 1959 split off 408 took the South Bay (San Jose and Santa Clara County) before that area was Silicon Valley; the 1991 split off 510 separated Oakland, Berkeley, and the East Bay from San Francisco; and the August 1997 split off 650 finally took the San Francisco Peninsula (Palo Alto, Mountain View, the rest of San Mateo County) out of 415, leaving the code with the city itself, most of Marin County across the Golden Gate Bridge, and a few small overlapping pieces of San Mateo. The result is the most geographically compact Bay Area code: San Francisco’s 47 square miles plus Marin.

415 was one of the very few American urban area codes that resisted overlay relief deep into the 21st century. Even after the 1997 split most San Francisco residents still made local calls with seven digits, and 415 continued operating in that mode until the overlay 628 was finally added on March 21, 2015, mandating ten-digit dialing across the territory. The delay made 415 a noticeably late-changing code, and by the time 628 launched, San Francisco’s residential and technical demographics had shifted significantly from the dot-com era — venture capital, biotech, and a much-changed cost-of-housing landscape had remade who held the numbers. 415 retains its cultural weight as the city’s defining identifier, deployed in hip-hop (E-40’s ‘415’ references, Mac Dre, the Bay Area scene generally), in business signaling for SF-headquartered firms, and as a marker distinguishing the city itself from the suburban codes (650, 510) that surround it.

How to Get a Phone Number with Area Code 415

There are three ways to get a phone number with the 415 area code, each suited to a different need:

1. Buy from a premium-number specialist. Companies that hold curated inventories of specific area codes can sell you a 415 number directly, often with a one-time fee and ownership transferred to you (no recurring carrier fees). This is the option for picking a specific memorable number, or for getting an area code that most carriers won’t let you request. Browse our 415 inventory.
2. Sign up with a VoIP carrier. Voice-over-IP services (such as Google Voice, OpenPhone, Grasshopper, and many others) can typically provision a 415 number on request, especially for active overlay codes. You won’t usually get to pick the specific number, but you’ll get a working line in the area code. This is the cheapest option for anyone who doesn’t need a particular number.
3. Port an existing 415 number. If you already have a 415 phone number with another carrier, you can transfer it (port it) to a new service provider while keeping the number. This works for landlines, cell phones, and VoIP services, though landlines outside of California sometimes can’t accept inbound ports of 415 numbers due to 911 routing rules.

Looking for a 415 number? 212areacode.com offers premium 415 numbers for San Francisco, California — choose your number, port it to any carrier in 3–5 business days, and pay a one-time fee with no monthly charges. Browse available 415 numbers →

Frequently Asked Questions

Is the 415 area code still in use?
Yes. 415 is actively assigned to new phone lines in the City and County of San Francisco, most of Marin County, and the northeast corner of San Mateo County.

What is the difference between 415 and 628?
Today they share the same geographic territory in California. New phone lines in the area may be assigned either code. The two codes work identically for calling, billing, and service.

Can I get a 415 number if I don't live in California?
Yes. Phone numbers are no longer tied to a physical address. With VoIP service or a number broker, you can hold a 415 number from anywhere in the world. The number routes to whatever device or carrier you specify.

Is 415 a scam area code?
No. 415 is a legitimate, active area code for the City and County of San Francisco, most of Marin County, and the northeast corner of San Mateo County. Like any area code, scammers occasionally spoof 415 caller IDs, but the code itself is heavily used by real California businesses, government offices, and residents.

Why did San Francisco keep seven-digit dialing for so long?
415 was one of the few urban area codes that wasn’t overlaid through the 1990s and 2000s, so calls within the territory didn’t need an area code prefix. Seven-digit dialing remained valid until the 628 overlay activated on March 21, 2015 and ten-digit dialing became mandatory.

Is 415 only for San Francisco?
415 covers the City and County of San Francisco, most of Marin County (across the Golden Gate Bridge), and a small portion of northeast San Mateo County. The Peninsula south of San Francisco uses 650; the East Bay uses 510.

Related Reading

• How Do Area Codes Work?
• When Did We Start Using Area Codes?