415 Area Code: San Francisco — From the Golden Gate to Marin

The 415 area code is one of the most recognized telephone codes in the United States — the official area code for the city and county of San Francisco and neighboring Marin County, California, in continuous service since January 1, 1947.

Area code 415 launched covering all of Northern California, but successive splits over the decades carved out Silicon Valley (408 in 1959), the East Bay (510 in 1991), and the Peninsula (650 in 1998), leaving 415 as the focused code of San Francisco proper and the Marin hills north of the Golden Gate. When the SF number pool needed relief, 628 was added as an all-services overlay in 2015, with mandatory ten-digit dialing required across the region. The time zone is Pacific (PT) throughout.

This guide covers what 415 serves today, explains the Bay Area splits that transformed it from an all-of-Northern-California code to a San Francisco and Marin code, and details the economy and institutions that drive 415 call traffic.

What 415 covers — San Francisco and Marin County

The 415 area code location is the city of San Francisco and Marin County — the narrow urban and suburban band on the western side of San Francisco Bay, connected by the Golden Gate Bridge. Today's 415 footprint is significantly smaller than its original 1947 reach; all surrounding Bay Area territories now have their own codes.

San Francisco neighborhoods in the 415 area code:

Marin County communities in the 415 area code: Sausalito · Mill Valley · San Rafael · Novato · Tiburon · Corte Madera · Larkspur · Fairfax · Belvedere · Ross

What 415 does NOT cover (adjacent Bay Area codes):

• East Bay (Oakland, Berkeley, Fremont) → 510 and 341
• Peninsula (Palo Alto, Menlo Park, Redwood City) → 650 and 564
• South Bay / Silicon Valley (San Jose, Cupertino, Santa Clara) → 408 and 669
• Sonoma County, Napa → 707

How 415 went from all of Northern California to just San Francisco and Marin

In 1947, area code 415 covered not just San Francisco but the entire Northern California region — from the Bay Area north to the Oregon border and east across the Sacramento corridor. It was one of two California area codes in the original NANP plan (213 covered Southern California), and it served every community in the state's northern half from a single three-digit code.

Population growth, the postwar suburban boom, and the eventual rise of the technology industry made that single-code assignment unsustainable. Over five decades, 415 was progressively reduced through four major splits:

1959 — 408 splits for the South Bay (Silicon Valley) The Santa Clara Valley's growth into what would eventually become Silicon Valley created enough demand for a dedicated code. 408 was carved out from 415 to serve San Jose, Santa Clara, Sunnyvale, and the entire South Bay corridor. Area code 415 lost its southern reach. Today, 408 is one of the most globally recognized area codes — home to Apple, Cisco, Intel, NVIDIA, Adobe, and Netflix.

1991 — 510 splits for the East Bay Oakland, Berkeley, Fremont, and the entire East Bay side of San Francisco Bay separated from 415 as 510. This was driven by the explosive growth of business and residential subscriptions across Alameda and Contra Costa counties during the 1980s.

1998 — 650 splits for the Peninsula The tech boom of the 1990s pushed number exhaustion across the Peninsula corridor — Palo Alto, Menlo Park, Mountain View, Redwood City, and surrounding communities between San Francisco and San Jose. 650 was carved out to serve this region, leaving 415 finally focused on the San Francisco peninsula and Marin County only.

2015 — 628 overlay added With San Francisco's tech sector growth accelerating through the 2010s and the proliferation of mobile devices, the remaining 415 pool faced exhaustion. Rather than split San Francisco from Marin, regulators added 628 as an all-services overlay — no existing 415 number changed, and new subscribers began receiving 628 numbers. Mandatory ten-digit dialing became required across the entire 415 / 628 region.

Area code 415 through the decades

January 1, 1947 — Area code 415 launched alongside 213 (Southern California) as one of the two original NANP codes assigned to California. It covered the entire northern half of the state — San Francisco, the Bay Area, Sacramento, and the northern coast. The original design gave California two codes for a population of about 10 million; that number would eventually require over 30.

1959 — 408 splits Silicon Valley's industrialization — still primarily orchards and canneries in 1947, but rapidly shifting toward electronics and defense — drove the first split. Area code 408 was assigned to the South Bay, beginning the long process of dividing the Bay Area into distinct telephone geographies.

1991 — 510 splits Thirty-two years of growth in the East Bay, fueled by the Port of Oakland, BART expansion, and the East Bay's role as a residential and commercial counterpart to San Francisco, created the demand for 510. Oakland, Berkeley, and the entire Alameda County corridor moved to the new code.

1998 — 650 splits The dot-com boom of the late 1990s made the Peninsula one of the fastest number-consuming regions in the country. Companies like Hewlett-Packard, Sun Microsystems, and hundreds of startups in Palo Alto and Menlo Park overwhelmed the remaining 415 number supply in the Peninsula. Area code 650 was split from 415, and 415 contracted to its current San Francisco and Marin footprint.

2015 — 628 overlay San Francisco's emergence as the global capital of the technology startup ecosystem — fueled by Salesforce, Lyft, Twitter/X, Dropbox, Pinterest, and hundreds of venture-backed companies — pushed the 415 pool toward exhaustion again. Area code 628 was introduced as a full overlay, opening a second pool without displacing any existing 415 number.

What the 415 economy runs on

San Francisco's economy is concentrated in technology, finance, healthcare, and tourism — four industries with global reach from a city of fewer than 900,000 residents:

Salesforce and the tech startup cluster Salesforce — the enterprise cloud software company that coined the term SaaS — has been headquartered in San Francisco since 1999. Its Salesforce Tower (the tallest building in San Francisco) anchors the Transbay district. The company's growth has been emblematic of SF's transformation from a financial and port city into a global tech capital. Alongside Salesforce, Lyft (ride-sharing), Dropbox (cloud storage), Pinterest (visual search), Block/Square (financial technology), and Yelp (local search) all maintain San Francisco headquarters — a startup-to-public-company pipeline fueled by proximity to Sand Hill Road venture capital in nearby Menlo Park.

Wells Fargo and financial services Wells Fargo has been headquartered in San Francisco since its founding in 1852 — originally as a banking and express delivery service during the Gold Rush. Today it is one of the four largest US banks by assets and employs more than 220,000 people nationally. San Francisco's financial services ecosystem also includes Charles Schwab (originally founded in SF), Visa (HQ in Foster City, just south of 415), and a dense concentration of private equity and hedge fund offices.

Golden Gate Bridge tourism San Francisco draws more than 25 million visitors annually, generating an estimated $9 billion in tourism-related economic activity. The Golden Gate Bridge, Alcatraz, Fisherman's Wharf, and the cable car system are among the most internationally recognized attractions in the United States. Tourism is San Francisco's second-largest industry by employment, supporting hotels, restaurants, and transportation across the city and Marin County's gateway communities. Contact us to explore 415 or 628 numbers for your San Francisco-area business presence.

UCSF and the Mission Bay biotech cluster The University of California, San Francisco (UCSF) is consistently ranked among the top five medical schools in the United States and is the city's largest employer. Its Mission Bay campus — a purpose-built biotech research district developed on former industrial land south of SoMa — houses UCSF hospitals, the UCSF Medical Center, and dozens of biotech and pharmaceutical companies drawn by proximity to the university's research talent. The broader SF biotech cluster has become one of the most significant in the world.

Is 415 in Texas?

No — 415 is San Francisco, California's area code and is not assigned in Texas. Texas has more than 20 area codes across its regions; 415 is not among them.

The "415 area code Texas" search pattern exists for the same reason most cross-state area code searches do: San Francisco-based companies — particularly in technology, venture capital, and financial services — make high-volume outbound calls to Texas business counterparts in Austin, Dallas, and Houston. Recipients who don't recognize the 415 prefix search their own state to identify the caller. The answer is always the same: 415 is San Francisco, California.

"1 415 area code" searches reflect international callers who have encountered a San Francisco number in the full +1 415 format used in international dialing. The +1 is the US country code; 415 is the San Francisco metro area code.

415 area code ZIP codes

Common ZIP codes within the 415 / 628 coverage area:

San Francisco (City) 94102 · 94103 · 94104 · 94105 · 94107 · 94108 · 94109 · 94110 · 94111 · 94112 · 94114 · 94115 · 94116 · 94117 · 94118 · 94121 · 94122 · 94123 · 94124 · 94127 · 94129 · 94130 · 94131 · 94132 · 94133 · 94134

Marin County 94901 · 94903 · 94904 · 94920 · 94925 · 94930 · 94939 · 94941 · 94945 · 94947 · 94949 · 94965

Note: ZIP codes in the East Bay (Oakland, Berkeley) use the 510 area code, not 415. Peninsula ZIP codes (Palo Alto, Menlo Park, Redwood City) use 650.

Scam calls from 415 numbers

San Francisco's association with major technology companies, financial institutions, and healthcare systems makes spoofed 415 numbers valuable to robocallers. Common spoofed 415 schemes include:

• Tech company impersonation — Callers claiming to represent Salesforce, Dropbox, Lyft, or another recognizable SF startup, using a 415 number as a credibility signal for tech support or billing scams.
• Wells Fargo and banking scams — Fraudulent calls impersonating Wells Fargo fraud departments, using spoofed 415 numbers to appear as legitimate San Francisco bank calls.
• Healthcare and insurance scams — Callers posing as UCSF billing offices, Blue Shield of California representatives, or Medicare coordinators targeting San Francisco and Bay Area residents.
• Real estate and investment scams — Given San Francisco's association with high-value real estate and venture capital, fraudulent investment pitches using 415 numbers are common in both the Bay Area and other major markets.

The FCC's STIR/SHAKEN call authentication framework requires carriers to verify caller ID, which is why many phones now display "Spam Risk" before suspected spoofed calls. An unsolicited 415 or 628 call that leaves no voicemail is almost certainly a spoof — legitimate SF businesses and institutions always leave a callback message.

Key takeaways

• 415 is San Francisco's area code — covering the city and county of San Francisco and Marin County, in continuous service since January 1, 1947.
• Area code 415 originally covered all of Northern California; successive splits created 408 (South Bay, 1959), 510 (East Bay, 1991), and 650 (Peninsula, 1998), reducing 415 to its current SF and Marin footprint.
• 628 is the 415 overlay, active since 2015. No existing 415 number changed; 628 opened a second pool for the same geography. Mandatory 10-digit dialing is required across the 415 / 628 region.
• 415 is not in Texas — it is exclusively San Francisco, California; high outbound call volume from SF's tech and financial sectors drives those search queries.
• Time zone: Pacific (PT) — PST (UTC −8) in winter, PDT (UTC −7) during Daylight Saving Time.
• San Francisco's economy spans Salesforce and the startup cluster, Wells Fargo and financial services, 25-million-visitor-per-year tourism, and UCSF's Mission Bay biotech research campus.

Frequently asked questions