If you've received a call from a number starting with 650 — or you're looking to build a local phone presence on the San Francisco Peninsula — you're in the right place. The 650 area code covers the heart of Silicon Valley in Northern California, home to some of the world's most influential technology companies and universities.
Whether you're identifying an incoming call, researching the area for business, or looking to get a local 650 number, this guide has everything you need: where 650 is located, which cities it covers, its time zone, how to spot scam calls, and how to get a local 650 number instantly.
The 650 area code is a North American Numbering Plan (NANP) telephone area code assigned to the San Francisco Bay Area in California. It is one of the state's most recognized area codes due to its deep association with Silicon Valley — the global hub of technology and innovation.
It serves San Mateo County and portions of northwestern Santa Clara County, stretching along the San Francisco Peninsula between San Francisco to the north and San Jose to the south.
The 650 area code location is the San Francisco Peninsula in Northern California, USA. It encompasses most of San Mateo County, a slice of northern Santa Clara County, and a small section of the southern San Francisco city limits. The region sits along the western shore of San Francisco Bay, bordered by the Pacific Ocean to the west and the Santa Cruz Mountains to the south — making a 650 phone number instantly recognizable in the tech and business world.
Major cities in the 650 area code:
The 650 area code was established on August 2, 1997, split from the original 415 area code to meet surging demand driven by Silicon Valley's internet boom. As tech startups, ISPs, and enterprises multiplied across the Peninsula, phone number demand outpaced what the 415 code could supply south of San Francisco.
The 650 area code operates entirely within the Pacific Time Zone (PT). Pacific Standard Time (PST) runs UTC−8 from November through March, and Pacific Daylight Time (PDT) runs UTC−7 from March through November.
California observes Daylight Saving Time — clocks spring forward in mid-March and fall back in early November. If you're calling a 650 number from the East Coast, keep in mind there is a 3-hour time difference.
The 650 area code is synonymous with Silicon Valley. The region houses the headquarters or major campuses of some of the world's most valuable companies:
Beyond tech, the area is known for San Francisco International Airport (SFO), high real estate values, and a business culture that drives billions in annual investment. For businesses, a 650 number signals local credibility in one of the world's most competitive markets.
Not all calls from 650 numbers are legitimate. Because the area code is associated with major tech companies like Google and Meta, scammers frequently spoof 650 numbers to appear more credible to unsuspecting recipients.
Common 650 area code scam types:
How to protect yourself:
If your business serves clients in the San Francisco Bay Area or Silicon Valley, a 650 area code phone number can significantly increase your local credibility and call answer rates. Customers are far more likely to pick up calls from a number that matches their local area code.
Getting a 650 number used to require a physical California presence. Today, any business can get an instant 650 virtual phone number through a cloud communications platform. With Softtop, you're up and running in minutes — no office required.
The 650 area code is far more than a string of digits — it's a geographic and cultural identifier tied to one of the most consequential technology regions on earth. Covering cities like Palo Alto, Mountain View, Menlo Park, and Redwood City across San Mateo County in California, it operates in the Pacific Time Zone and was established in 1997 as Silicon Valley's growth outpaced the original 415 code.