Area Code for San Jose

San Jose sits at the geographic and cultural center of Silicon Valley, and its two area codes — 408 and 669 — carry that identity in every call. Area code 408 has been dialed here since March 1959, predating the term “Silicon Valley” by over a decade. The 669 overlay arrived in November 2012 to handle number exhaustion from the region’s relentless growth.

If you are dialing into San Jose or setting up a local business number for the South Bay, this guide covers everything: which code covers which city, the full history, the Silicon Valley business case for a 408 number, and the fraud patterns you should know.

What’s the area code for San Jose?

San Jose’s primary area code is 408. A second code, 669, covers the same territory as a full geographic overlay. Both are valid San Jose area codes — the difference is age and brand recognition.

Code	Established	Coverage	Notes
408	March 1, 1959	All of Santa Clara County + portions of Alameda, Santa Cruz Counties	Original Silicon Valley code; high brand recognition
669	November 20, 2012	Identical to 408 (full overlay)	Added for number relief; new VoIP and IoT lines often carry 669

The California Public Utilities Commission (CPUC) approved the 669 overlay to handle demand from VoIP services, mobile lines, and the wave of connected devices manufactured and deployed by Bay Area tech companies. Both codes now require 10-digit local dialing: area code + 7-digit number.

South Bay area codes by region

The South Bay is not monolithic — different cities and neighborhoods sit in different area code zones, and the Peninsula codes (650) are often confused with San Jose proper.

408 / 669 — Santa Clara County core

San Jose’s neighborhoods — Downtown, Willow Glen, Almaden Valley, Blossom Hill, Evergreen, Berryessa — are all 408/669. So are the adjacent tech-company cities:

• Cupertino — Apple Park and the surrounding residential grid
• Santa Clara — NVIDIA headquarters, Intel headquarters, Levi’s Stadium
• Sunnyvale — LinkedIn, Juniper Networks, Yahoo’s former campus
• Campbell — southwest San Jose suburbs
• Milpitas — northeastern edge near the 880 corridor
• Los Gatos — Netflix headquarters, hillside communities
• Saratoga — affluent residential; still 408
• Morgan Hill and Gilroy — southern Santa Clara County

650 — Peninsula (not San Jose)

Palo Alto, Mountain View, Menlo Park, Redwood City, and San Mateo use 650. This is the geographic home of Google (Mountain View), Stanford University (Palo Alto), Meta/Facebook (Menlo Park), and many venture capital firms.

Despite being adjacent to San Jose, Mountain View and Palo Alto are in a different area code zone — a detail that matters when configuring local-presence dialing for sales teams.

510 / 341 — East Bay

Oakland, Berkeley, Fremont, Hayward, and Newark use 510, with the 341 overlay added in 2023. The East Bay is across San Francisco Bay from San Jose — a separate market with its own codes.

925 — Inland East Bay / Tri-Valley

Concord, Walnut Creek, Livermore, Pleasanton, and Antioch use 925. These communities are south and east of Oakland, connected to San Jose via the 680 corridor.

History of San Jose area codes

The story of 408 mirrors the story of Silicon Valley itself.

1959 — 408 is born. The original North American Numbering Plan, set up in 1947, assigned all of California to just two codes: 415 (Northern California) and 213 (Southern California). As the postwar population boomed, 415 was split. On March 1, 1959, area code 408 was carved out to serve Santa Clara, Santa Cruz, Monterey, and San Benito Counties. San Jose was already the region’s largest city, and 408 became its permanent identifier.

At the time, the region was still the “Valley of Heart’s Delight” — the world’s largest prune, apricot, and cherry producing region. Orchards covered over 100,000 acres. The semiconductor industry was only just beginning to take shape around the Shockley Semiconductor laboratory in Mountain View (1956) and Fairchild Semiconductor (1957).

1998 — The 831 split. By the late 1990s, the original 408 territory was running low on available numbers. The coastal counties — Monterey, Santa Cruz, and San Benito — were split off into the new 831 area code, effective July 11, 1998. A permissive dialing period ran through February 20, 1999. After the split, 408 was confined to Santa Clara County and its immediate edges — a far smaller territory, but still one of the densest concentrations of telephone lines in the world.

2012 — The 669 overlay. By the early 2010s, 408 was exhausted again. The CPUC approved an overlay plan. Area code 669 went live on November 20, 2012, following a permissive period that ran from April 21 through October 20, 2012. Unlike a geographic split — which would have reassigned existing numbers — an overlay keeps all existing 408 numbers intact and assigns new numbers from the 669 pool. Local calls now require 10-digit dialing.

The source of the exhaustion was Silicon Valley itself: every new VoIP line, every IoT device, every startup’s phone system, every corporate PBX expansion consumed 408 numbers at a rate no other county in the country could match.

408 as Silicon Valley identity

The 408 prefix is more than a routing code — it is a brand signal in the tech world.

Apple’s corporate campus in Cupertino has been 408 since before the company existed. Cisco’s San Jose headquarters is 408. Adobe, eBay, NVIDIA, Intel, Western Digital, Broadcom, and PayPal — all founded or headquartered in Santa Clara County — built their businesses on 408 numbers. The county alone hosts an estimated 6,500 to 7,000 high-technology companies.

For a startup or sales team operating outside the Bay Area, a 408 number communicates instant geographic credibility. Venture capitalists, enterprise IT buyers, and tech recruiting teams recognize 408 as a Silicon Valley number without thinking about it — the same way 212 signals New York or 312 signals Chicago.

Area code 669 is functionally identical but carries less brand recognition. If you are choosing between a 408 and a 669 number for a business line targeting Silicon Valley contacts, the 408 prefix will perform better on outbound call answer rates. This is a documented local-presence dialing effect: people are more likely to answer numbers they recognize as local and familiar.

San Jose area code spam and scams

The authority that makes 408 valuable for business also makes it a target for fraud. Scammers spoof 408 and 669 numbers specifically because a Silicon Valley area code lends instant credibility to fake calls.

Common fraud patterns in 408/669:

• Fake Apple and Google support calls — callers impersonate Apple Security or Google Account Recovery, claim your account has been breached, and request remote device access or Apple Gift Card payment.
• LinkedIn recruiter impersonation — tech workers receive calls from spoofed 408 numbers claiming to be recruiters from FAANG companies offering equity-heavy offers. The goal is personal data or upfront “background check” fees.
• Equity vesting fraud — targets startup employees near a vesting cliff. Fraudulent “company finance department” calls using 408 numbers instruct employees to transfer funds to “updated payroll accounts.”
• Tech support scam pop-ups — a browser pop-up displays a fake “Microsoft Security Alert” with a 408 or 669 callback number. The callback connects to offshore call centers pretending to be Cupertino or Santa Clara-based support teams.

How to protect yourself: STIR/SHAKEN call authentication (learn more at /glossary/stir-shaken) requires carriers to attest the legitimacy of calls. An “A-attestation” means the carrier has verified the calling number belongs to the originating subscriber.

DialPhone’s 408 and 669 business numbers carry A-attestation, which means calls you make from your business line are displayed as verified to recipients — not flagged as potential spam. For incoming calls, the FCC recommends verifying unexpected 408 calls through official company websites rather than callback numbers supplied in the call itself.

See the FCC’s guidance on spoofing and caller ID: https://www.fcc.gov/consumers/guides/spoofing-and-caller-id.

How to get a San Jose business phone number

Getting a 408 or 669 business number through DialPhone takes five steps and no hardware.

1. Choose your plan. Visit /pricing and select the plan that matches your team size. All DialPhone plans include local number selection.
2. Select your area code. During signup, search for available 408 or 669 numbers. Both codes have inventory. If you want a specific prefix pattern, filter by exchange.
3. Port an existing number (optional). If you have a current San Jose number from another carrier, DialPhone handles the port. California port times average 3–5 business days for local numbers. See the number porting guide for the process and required documentation.
4. Configure your call flow. Set up your auto-attendant, ring groups, voicemail-to-email, and AI receptionist through the DialPhone dashboard. DialPhone AI Receptionist answers and routes calls when your team is unavailable.
5. Start making and receiving calls. Your 408 or 669 number is live on the DialPhone app, desk phone, or browser. Outbound calls present your San Jose number to recipients. A-attestation is applied automatically — your business calls are marked as verified, not spam.

Start with a free trial or contact the team for enterprise pricing.

Famous companies in the San Jose / South Bay area codes

The 408/669 territory is one of the most consequential business addresses on earth. A partial list of major companies headquartered or founded in the Santa Clara County area code zone:

• Apple — One Apple Park Way, Cupertino. Founded 1976 in Los Altos (408). Largest company in the world by market cap.
• Cisco Systems — 170 West Tasman Drive, San Jose. The network infrastructure company that powers the internet was a 408 business from its 1984 founding.
• NVIDIA — 2788 San Tomas Expressway, Santa Clara. The GPU company that became the backbone of AI computing is headquartered in the 408 zone.
• Adobe — 345 Park Avenue, San Jose. Creative and document cloud software, founded 1982 in Mountain View (then 408 territory).
• eBay — 2025 Hamilton Avenue, San Jose. Founded in San Jose in 1995 with a 408 number.
• Intel — 2200 Mission College Boulevard, Santa Clara. Co-founded 1968 in Mountain View; long-established 408 presence.
• Netflix — 100 Winchester Circle, Los Gatos. The streaming pioneer is headquartered in 408 territory even as it operates globally.
• PayPal — 2211 North First Street, San Jose. Originally founded as Confinity in Palo Alto (650) but has been headquartered in San Jose (408) since its early scale years.
• Western Digital — 5601 Great Oaks Parkway, San Jose. Data storage company with deep roots in the 408 area.
• Broadcom — originated in San Jose; its semiconductor legacy traces to 408 throughout its growth years.

For a business targeting any of these companies’ supply chains, partners, or employee bases, a 408 area code number is the most direct way to establish local credibility at first ring.

San Jose area code FAQ

San Jose area code FAQ

What is the area code for San Jose, California? +

San Jose uses two area codes: 408 and 669. Area code 408 has served the city since 1959, when it was split from the original California 415 area code. Area code 669 was added on November 20, 2012, as an overlay to address number exhaustion driven by the explosion of VoIP lines and IoT devices from Silicon Valley tech companies.

Both codes serve exactly the same geographic territory. If you receive a call from either 408 or 669, it is coming from the San Jose metro or the broader Santa Clara County area.

Is 669 the same area as 408? +

Yes. Area code 669 is a full overlay on 408, meaning both codes cover identical geography: San Jose, Sunnyvale, Santa Clara, Cupertino, Campbell, Milpitas, Saratoga, Los Gatos, Morgan Hill, Gilroy, and surrounding communities in Santa Clara County.

The difference is brand recognition. The 408 prefix is synonymous with Silicon Valley and carries instant credibility with Bay Area contacts. Area code 669 is less familiar but fully local — and newer VoIP lines, IoT devices, and business phone services frequently carry 669 numbers.

What area code is Mountain View and Palo Alto? +

Mountain View and Palo Alto are served by area code 650, not 408 or 669. The 650 code covers the San Francisco Peninsula — San Mateo County and the northern part of Santa Clara County, including Palo Alto, Mountain View, Menlo Park, Redwood City, and San Mateo.

Google's Mountain View headquarters is technically in the 650 zone, even though it is in the heart of Silicon Valley. Stanford University (Palo Alto) also uses 650.

What area code is Oakland and the East Bay? +

Oakland and the East Bay use area code 510, established in 1991 when it split from the original 415. Cities covered include Oakland, Berkeley, Fremont, Hayward, Newark, Union City, and Alameda.

In 2023, area code 341 was activated as an overlay on 510, following the same pattern as 669 overlaying 408 — new numbers in the East Bay may carry either a 510 or 341 prefix.

Can I still get a 408 number for my business? +

Yes. Both 408 and 669 numbers are available for new business phone lines through VoIP providers like DialPhone. You do not need a physical San Jose address to get a local 408 or 669 number — a virtual business phone line lets any company present a Silicon Valley local number to customers and prospects.

For businesses targeting the tech sector, a 408 number signals local presence and builds immediate trust with Bay Area decision-makers. See DialPhone's /pricing page for plans that include local number selection.

Are 408 and 669 calls common for phone scams? +

Yes. Because 408 and 669 numbers carry Silicon Valley brand authority, scammers frequently spoof these area codes to make fraudulent calls appear to come from Apple, Google, Cisco, or other tech companies.

Common schemes include fake Apple iCloud breach alerts, Microsoft tech support impersonation, and LinkedIn recruiter fraud targeting tech workers. STIR/SHAKEN call authentication (A-attestation) helps carriers flag spoofed calls, but verification is not universal across all networks. Always verify unexpected calls from 408 or 669 through official company channels before taking action.

What happened to the Monterey and Santa Cruz area codes that used to be 408? +

Area code 831 was created on July 11, 1998, by splitting Monterey County, Santa Cruz County, and San Benito County out of the 408 territory. A permissive dialing period ran until February 20, 1999.

Before 1998, a call to Monterey, Salinas, or Santa Cruz from a 415 San Francisco number was a different area code — but all three were reachable via 408. Today, 831 is the sole code for those coastal communities, while 408/669 is confined to Santa Clara County and immediate surroundings.

Do I need to dial 1 before a local 408 or 669 number? +

Since the 669 overlay was activated in 2012, all calls within the 408/669 region require 10-digit or 11-digit dialing: 1 + area code + 7-digit number, or simply area code + 7-digit number depending on your carrier.

The California Public Utilities Commission (CPUC) confirmed that the overlay does not change call costs — a local 408 call dialed as 1-408-XXX-XXXX is still billed at local rates. Emergency services (911) and abbreviated codes like 311, 411, 511, and 811 continue to use 3-digit dialing.

Get a San Jose business number

A 408 or 669 number positions your business inside Silicon Valley without requiring a physical office there. DialPhone provides business phone lines and AI receptionist service with local number selection, STIR/SHAKEN A-attestation, and same-day activation.

• Start a free trial — pick your 408 or 669 number during signup
• See all plans and pricing
• Learn about number porting — bring your existing San Jose number

Related area code pages:

• 408 area code — detailed coverage map and city list
• 669 area code — overlay reference page
• California area codes — full state index