San Francisco is served by 6 active area codes as of 2026, layered through decades of overlays and splits across the metro area. This guide walks through which code covers which part of the region, why so many codes are needed, and what new codes may come next.
The Short Answer
San Francisco currently has 6 active area codes in service. The count reflects a combination of population growth, the rise of mobile lines, and the way modern numbering allocates blocks — every line activated, whether a cellphone, a business desk line, a VoIP number, or a connected device, consumes a slot in the pool.
San Francisco has roughly 4,648,486 residents as of the most recent estimates. That population, combined with the spread of mobile and VoIP lines per household, determines how often new area codes are needed.
The Full List of San Francisco Area Codes
The active area codes serving San Francisco are listed below, in numerical order. Where a code is an overlay or a split-off from an earlier code, that relationship is noted.
- 341 — Inner East Bay (Oakland, Berkeley) (overlay of 510)
- 415 — San Francisco and Marin County
- 510 — Inner East Bay (Oakland, Berkeley, western Contra Costa) (split from 415)
- 628 — San Francisco and Marin County (overlay of 415)
- 650 — San Mateo County and the Peninsula (split from 415)
- 925 — Inland East Bay (Contra Costa interior and the Tri-Valley) (split from 510)
How San Francisco’s Area Codes Grew Over Time
San Francisco received its first area code, 415, when the North American Numbering Plan launched in 1947. That single code initially covered the entire state, and subsequent splits and overlays narrowed it over the decades that followed.
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Browse San Francisco Area Codes →- 1947 — 415 was assigned as one of the original North American area codes, covering central California. Its territory then stretched well beyond today's metro, taking in San Francisco, the East Bay, the Peninsula, and the North and South Bay.
- 1959 — 415 was divided for the first time, with 408 carved out for San Jose and the South Bay and 707 carved out for the North Bay. Both serve regions outside today's San Francisco-Oakland metropolitan area.
- 1991 — 510 split from 415 on September 2, creating a separate code for the East Bay, including Oakland, Berkeley, and Richmond.
- 1997 — 650 split from 415 on August 2 for most of San Mateo County and the Peninsula, leaving 415 to San Francisco and Marin County.
- 1998 — 925 split from 510 on March 14 for the inland East Bay, following the Berkeley Hills and covering Contra Costa's interior and the Tri-Valley.
- 2015 — 628 was added as an overlay of 415, the first overlay code for San Francisco and Marin County.
- 2019 — 341 was added as an overlay of 510 in the East Bay, activated July 22, with mandatory ten-digit dialing for the region.
Why San Francisco Has Multiple Area Codes
A single area code can hold roughly 7.9 million possible phone numbers in theory — 792 valid central office codes (the second three digits) multiplied by 10,000 line numbers each. In practice the usable count is lower, because blocks of numbers are reserved, withheld, or assigned in bulk to carriers that may never fully use them. When the pool of available numbers in an area code falls below the threshold the North American Numbering Plan Administrator (NANPA) tracks, the state requests relief, and either a split or an overlay is approved.
San Francisco’s population of roughly 4,648,486 residents would, on its own, fit comfortably inside a single area code’s capacity. The reason 6 codes are needed instead is that every adult typically carries at least one mobile line, many households have multiple lines per person, businesses concentrate phone numbers at extreme density, and connected devices, VoIP services, and second-line apps all draw from the same pool. The math compounds quickly.
San Francisco Area Codes by District
San Francisco and Marin (415, 628): The city of San Francisco plus Marin County north of the Golden Gate. 415 is the original 1947 code; 628 was overlaid on it in 2015. New lines in the city may be assigned either code.
The Peninsula (San Mateo County) (650): Daly City, San Francisco International Airport, Burlingame, and south through Palo Alto. Split from 415 in 1997. It remains a single code with no overlay.
Inner East Bay (510, 341): Oakland, Berkeley, Alameda, and the western Contra Costa cities such as Richmond and El Cerrito. 510 split from 415 in 1991; 341 was overlaid in 2019.
Inland East Bay (925): The interior of Contra Costa County (Concord, Walnut Creek, Antioch) and the Tri-Valley cities of Pleasanton, Livermore, and Dublin. Split from 510 in 1998.
What’s Next for San Francisco Area Codes
NANPA’s most recent NPA exhaust analysis (October 2025) shows long runways for most of the metro’s codes: the 415/628 pair in San Francisco and Marin is not projected to exhaust until the first quarter of 2065, the 510/341 East Bay pair until the second quarter of 2068, and 925 until the first quarter of 2050. The nearest pressure point is 650 on the Peninsula, which still has no overlay and is projected to exhaust in the third quarter of 2039, making it the metro’s most likely candidate for the next relief, most probably an overlay. No San Francisco-Oakland numbering plan area is on NANPA’s near-term, next-36-months relief schedule.
Frequently Asked Questions
How many area codes does San Francisco have right now?
San Francisco has 6 active area codes in service across the territory it covers, including any overlays that share geography with an older code.
What is the oldest area code in San Francisco?
415 is the oldest active area code in San Francisco, assigned in 1947 when the North American Numbering Plan launched. It remains in service today, though its geographic footprint has typically been reduced by subsequent splits and overlays.
What is the newest area code in San Francisco?
The most recent area code addition to San Francisco was 341, activated in 2019. New phone lines provisioned in its service area are increasingly drawn from this code as older overlays approach exhaustion.
Why does San Francisco need so many area codes?
Population growth combined with the proliferation of mobile lines, business direct-dial numbers, VoIP services, and connected devices has exhausted older codes faster than the original 1947 plan anticipated. Each new area code adds roughly 7.9 million additional phone numbers to the regional pool.
Is San Francisco's area code 415 or 628?
Both. 415 is the original San Francisco area code, dating to 1947, and it also covers Marin County. 628 was added in 2015 as an overlay over the same territory, so new lines in the city may be assigned either code. Existing 415 numbers did not change when 628 arrived.
What area code do Oakland and Berkeley use?
The inner East Bay, including Oakland, Berkeley, Alameda, and Richmond, uses 510, with 341 added as an overlay in 2019. Both codes now serve the same area, and ten-digit dialing is required for all calls.
Does the Peninsula have its own area code?
Yes. The Peninsula and most of San Mateo County use 650, which split from 415 in 1997 and runs from Daly City and San Francisco International Airport south through Palo Alto. San Jose and the South Bay, by contrast, use 408 and 669 and belong to a separate metro.
What does the 925 area code cover?
925 serves the inland East Bay: the interior of Contra Costa County (Concord, Walnut Creek, Antioch) and the Tri-Valley cities of Pleasanton, Livermore, and Dublin. It split from 510 in 1998 along the line of the Berkeley Hills.
Are 707 and 408 part of the San Francisco metro?
No. 707 covers the North Bay and Wine Country (Napa, Sonoma, Solano) and 408 and 669 cover San Jose and the South Bay. Both regions are often called part of the greater Bay Area, but they fall outside the five-county San Francisco-Oakland metropolitan area, which is served by 415, 628, 510, 341, 650, and 925.
Ready to Get a Number in San Francisco?
We carry available San Francisco numbers right now across multiple area codes. Order directly in 415, 628, 341, 510, or 650 — a one-time fee, no monthly charges, with pricing From $150 depending on the digit pattern and memorability of the number. Prefer help choosing? Call us at (212) 580-2000.
