408 Area Code: San Jose, California — Cities, Overlay & Business Guide

The 408 area code is the telephone prefix of Silicon Valley. It covers San Jose — the largest city in Northern California and the tenth-largest in the United States — along with most of Santa Clara County, the densest concentration of technology companies anywhere on earth.

Apple is in Cupertino, Nvidia and Intel are in Santa Clara, and Cisco, Adobe, eBay, and PayPal are all in San Jose, every one of them inside the 408 footprint. Few three-digit codes carry the cultural weight that 408 does.

This guide covers the full picture: which Silicon Valley cities 408 serves, how it relates to its 669 overlay and to neighboring codes like 650, 415, and 510, the code's history since it split from 415 in 1959, and exactly how to activate a 408 virtual number for your business in minutes — no Santa Clara County office required.

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The 408 area code is assigned to most of Santa Clara County and a portion of northern Santa Cruz County in California. It was created on March 1, 1959, when it was split from the original 415 area code that once covered the entire San Francisco Bay Area.

At first, 408 stretched across Santa Clara, Santa Cruz, Monterey, and San Benito counties; the southern counties were later carved out into area code 831 in 1998, leaving 408 focused on the South Bay and Silicon Valley that it represents today.

Dialing Format and Time Zone

• Dialing format: (408) 555-0182
• International: +1 408-555-0182
• Time zone: Pacific Time (PT) — UTC−8 Standard, UTC−7 Daylight Saving (March–November)
• 10-digit dialing required for all local calls, due to the 669 overlay

The 408 area code covers the South Bay region of the San Francisco Bay Area — the southern end of the bay, anchored by San Jose and surrounded by the cluster of cities that together form Silicon Valley. The footprint runs across most of Santa Clara County and dips into northern Santa Cruz County, taking in everything from dense urban downtown to suburban tech campuses and the agricultural valley to the south.

Major Cities and Communities

• San Jose — the Bay Area's largest city and Santa Clara County seat; downtown is home to Adobe and a fast-growing tech and startup core
• Santa Clara — headquarters city for Nvidia, Intel, and others, plus Santa Clara University and Levi's Stadium
• Sunnyvale — a major employment hub hosting offices for tech and aerospace firms in the heart of the valley
• Cupertino — home to Apple Park, the company's circular global headquarters
• Campbell — a walkable suburban city with a lively downtown along the historic Campbell Avenue
• Milpitas — a manufacturing and logistics center at the northeast edge of the valley
• Los Gatos — an affluent foothill town and home to Netflix's headquarters campus
• Saratoga and Monte Sereno — quiet, upscale residential communities in the western foothills
• Morgan Hill and Gilroy — south county cities blending residential growth with the valley's agricultural roots; Gilroy is famous for its garlic
• A portion of Palo Alto and parts of northern Santa Cruz County also fall within the 408 service area

While the Peninsula cities of Palo Alto, Mountain View, and Menlo Park sit mostly under the 650 area code just to the north, they belong to the same continuous Silicon Valley economy as 408. Many businesses maintain a presence across both codes.

The 408 area code observes Pacific Time (PT). That means UTC−8 during Standard Time, from early November to mid-March, and UTC−7 during Daylight Saving Time, from mid-March to early November. The entire Silicon Valley region shares this zone with the rest of California and the West Coast.

For business, Pacific Time means a 408 number is three hours behind the East Coast. A West Coast morning lines up with the East Coast lunch hour, so teams selling into both coasts often plan outbound calls early in the day to catch Eastern contacts before their afternoon ends. A local 408 number paired with smart call routing keeps you reachable across those windows.

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As Silicon Valley's appetite for phone numbers grew — driven by mobile phones, data lines, and the sheer density of businesses in the region — the supply of available 408 numbers ran low. Rather than split the region geographically, regulators added an overlay: the 669 area code, which became effective on November 20, 2012, as the first overlay in the San Francisco Bay Area.

• 408 — the original Silicon Valley code, still the most recognized prefix for San Jose and Santa Clara County
• 669 — the overlay covering the exact same geographic area as 408; new numbers in the region are often issued as 669
• Because 408 and 669 share territory, 10-digit dialing (area code plus number) is mandatory for every local call

Around the South Bay, several neighboring codes serve the rest of the Bay Area and beyond. The 650 code covers the Peninsula — Palo Alto, Mountain View, and San Mateo — just to the north and west. San Francisco uses 415 and its overlay 628, while the East Bay around Oakland is served by 510. To the south, area code 831 covers Santa Cruz, Monterey, and the central coast.

Together these codes ring the bay around Silicon Valley, with 408 holding the South Bay center.

No area code in the country is more closely tied to a single industry than 408 is to technology. Santa Clara County is the headquarters region of Silicon Valley, and a 408 number places a business inside the global center of computing, semiconductors, software, and the internet economy.

Key Industries

The 408 region is built on technology in every form: semiconductors and chip design, computer hardware and networking equipment, enterprise and consumer software, internet platforms, electronic payments, and a deep venture capital and startup ecosystem. Supporting industries — engineering services, advanced manufacturing, professional services, and a growing biotech and clean-energy sector — fill out an economy that draws talent and investment from around the world.

Notable Companies and Landmarks

The roster of companies headquartered inside the 408 footprint reads like a history of modern computing. Apple's Apple Park is in Cupertino. Nvidia and Intel are in Santa Clara. Cisco, Adobe, eBay, and PayPal are all in San Jose, and Netflix is based in Los Gatos. Western Digital, AMD, and dozens of other hardware and software firms share the same ZIP codes.

Landmarks include Levi's Stadium in Santa Clara, the San Jose downtown core, and Santa Clara University, the oldest higher-education institution in California.

Why a 408 Number Signals Tech Credibility

In the technology world, a 408 number is shorthand for being where the work happens. For startups raising capital, vendors selling into Silicon Valley enterprises, and recruiters chasing engineering talent, a local 408 line signals proximity to the people and companies that define the industry — often before a single word is exchanged.

Modern VoIP and cloud phone providers let you activate a 408 Silicon Valley number in minutes — no Santa Clara County office, no hardware, and no long-term contract required. You search available 408 numbers, pick the one you want, complete a quick verification, and configure routing, voicemail, and an auto-attendant from a single dashboard. The number is live and callable shortly after activation.

A 408 number is especially valuable for startups, SaaS companies, hardware vendors, recruiters, and any business that sells into or serves the Silicon Valley market and wants instant local credibility. MeraTalk provides 408 virtual phone numbers as part of its cloud telephony platform — numbers activate in minutes, route to any device anywhere in the world, and pair with call recording, auto-attendant, and CRM integration from day one. Search available 408 numbers at meratalk.com.

Silicon Valley does business with the whole planet, so South Bay lines receive international calls constantly — from overseas investors, offshore engineering teams, and global suppliers. The pattern is standard: the caller dials their country's exit code, then the North American country code 1, then the full ten-digit number. From most of Europe that looks like 00 1 408 555 0182; on any mobile phone worldwide, +1 408-555-0182 connects directly, because the plus sign substitutes the correct exit code automatically.

• From the UK and most of Europe: 00 + 1 + the ten-digit number
• From India: 00 + 1 + the ten-digit number
• From any mobile: +1 followed by the ten digits

Companies that field overseas calls should publish the +1 format on websites, email signatures, and pitch decks so international contacts never have to guess the dialing sequence. For more, see 408 area code.

It might seem ironic that the region that built email, chat, and video calling still cares about three digits on a caller ID — but it does. People screen unfamiliar calls aggressively, and a recognizable South Bay prefix is far more likely to be answered than an anonymous out-of-state string. For recruiters, sales teams, and founders chasing busy engineering leaders, that answer rate decides whether a conversation happens at all.

Local digits also carry quieter benefits. They anchor a listing in local search results, reassure a prospect that a vendor genuinely operates in the market, and give callbacks a consistent identity that contacts learn to recognize. Even fully remote companies selling into Santa Clara County adopt a local line for exactly these reasons: the number works as marketing, credibility, and customer service at once, with less effort than any other local signal available.

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