Area code 408 covers San Jose and surrounding areas in California. It was activated in 1959 as an overlay of area code 415. Today it shares its territory with overlay code 669.
| State | California |
|---|---|
| Primary city | San Jose |
| Cities also served | San Jose, Sunnyvale, Santa Clara, Cupertino, Mountain View (part), Milpitas, Campbell, Saratoga |
| Time zone | Pacific (UTC-8 / UTC-7 DST) |
| Year established | March 1, 1959 |
| Original 1947 NPA? | No |
| Parent code | 415 |
| Overlay codes | 669 |
| Currently in use? | Yes, actively assigned |
| Ten-digit dialing required? | Yes |
History of Area Code 408
Area code 408 was activated on March 1, 1959 in connection with area code 415. The decision was driven by population growth and the exhaustion of available phone numbers in the original numbering plan area.
Since its activation, the geographic area covered by 408 has been reshaped by the following splits:
- 1959 — area code 408 split off to cover the South Bay and Central Coast — San Jose, Santa Clara County, Santa Cruz, Monterey, San Benito — split from 415 on March 1, 1959
- 1998 — area code 831 split off to cover Santa Cruz, Monterey, and San Benito counties — split from 408 on July 11, 1998, leaving 408 with just Santa Clara County
Overlay codes have been added to the same geographic territory in:
- 2012 — area code 669 activated as an overlay
Cities and Areas Served by 408
Area code 408 serves Santa Clara County, the heart of Silicon Valley, including the following cities and communities:
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- Sunnyvale
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- Mountain View (part)
- Milpitas
- Campbell
- Saratoga
- Los Gatos
- Morgan Hill
- Gilroy
Nearby area codes covering the same broader region include: 669, 415, 628, 650, 510, 831, 925.
Overlay Codes 408
Area code 669 shares the same geographic territory as 408 (added in 2012). New phone numbers in the region may be assigned either code.
Because multiple area codes serve the same area, ten-digit dialing is mandatory for all local calls. A call from any of these codes originates from the same geographic region in California.
The Cultural Weight of a 408 Number
Area code 408 was created on March 1, 1959 in California’s first geographic area code split, when the South Bay and Central Coast (San Jose, Santa Clara County, Santa Cruz, Monterey, San Benito) were carved out of 415’s original territory. At the time of the split, Santa Clara Valley was still known as the ‘Valley of Heart’s Delight’ — the largest fruit-producing region in the world, dominated by orchards and family farms. The first Hewlett-Packard products had recently been manufactured in a Palo Alto garage, Stanford Industrial Park was eight years old, and William Shockley had just opened the semiconductor laboratory in Mountain View that would eventually birth Fairchild Semiconductor, Intel, and the broader integrated-circuit industry. None of that was visible from 408’s 1959 territory map. By the 1998 split, when Santa Cruz and Monterey moved into the new 831 area code and 408 was narrowed to Santa Clara County alone, the valley had been completely transformed: orchards replaced by office parks, Apple in Cupertino, Intel in Santa Clara, Cisco in San Jose, and a dense ecosystem of venture-backed startups stretching from Palo Alto to Gilroy.
408 is the geographic heart of Silicon Valley in a way that no other code is — 650 (the Peninsula, including Palo Alto and Mountain View) and 415 (San Francisco) share the broader regional identity, but 408 is where the major semiconductor and hardware companies cluster: Apple, Intel, AMD, Nvidia, Cisco, Adobe, eBay, Western Digital, and dozens of others. The cultural weight of a 408 number in the technology industry is substantial, signaling proximity to the engineering work that defines the region. The overlay 669 activated on November 20, 2012 ended seven-digit dialing in Santa Clara County, and the combined 408/669 complex now serves a population of approximately 1.9 million residents across the county. The 408/669 NPA is not projected to exhaust before the late 2030s under current allocation patterns.
How to Get a Phone Number with Area Code 408
There are three ways to get a phone number with the 408 area code, each suited to a different need:
- Buy from a premium-number specialist. Companies that hold curated inventories of specific area codes can sell you a 408 number directly, often with a one-time fee and ownership transferred to you (no recurring carrier fees). This is the option for picking a specific memorable number, or for getting an area code that most carriers won’t let you request. Contact us about a 408 number.
- Sign up with a VoIP carrier. Voice-over-IP services (such as Google Voice, OpenPhone, Grasshopper, and many others) can typically provision a 408 number on request, especially for active overlay codes. You won’t usually get to pick the specific number, but you’ll get a working line in the area code. This is the cheapest option for anyone who doesn’t need a particular number.
- Port an existing 408 number. If you already have a 408 phone number with another carrier, you can transfer it (port it) to a new service provider while keeping the number. This works for landlines, cell phones, and VoIP services, though landlines outside of California sometimes can’t accept inbound ports of 408 numbers due to 911 routing rules.
212areacode.com specializes in Manhattan 212 numbers and select premium area codes. We don’t currently maintain a 408 inventory, but we may be able to source a 408 number through our carrier relationships. Contact us with your requirements and we’ll let you know what’s available.
Frequently Asked Questions
Is the 408 area code still in use?
Yes. 408 is actively assigned to new phone lines in Santa Clara County, the heart of Silicon Valley.
What is the difference between 408 and 669?
Today they share the same geographic territory in California. New phone lines in the area may be assigned either code. The two codes work identically for calling, billing, and service.
What is the parent area code of 408?
Area code 408 is an overlay of 415. Both codes serve the same region of California.
Can I get a 408 number if I don't live in California?
Yes. Phone numbers are no longer tied to a physical address. With VoIP service or a number broker, you can hold a 408 number from anywhere in the world. The number routes to whatever device or carrier you specify.
Is 408 a scam area code?
No. 408 is a legitimate, active area code for Santa Clara County, the heart of Silicon Valley. Like any area code, scammers occasionally spoof 408 caller IDs, but the code itself is heavily used by real California businesses, government offices, and residents.
Is 408 the Silicon Valley area code?
408 is the most central Silicon Valley area code, covering Santa Clara County — San Jose, Sunnyvale, Santa Clara, Cupertino, and the surrounding cities where most of the major semiconductor and hardware companies are headquartered. Silicon Valley extends into 650 (the Peninsula) and arguably 415 (San Francisco) as well.
Was 408 always a Silicon Valley area code?
No — when 408 was created in 1959, Santa Clara Valley was known as the ‘Valley of Heart’s Delight’ and was the largest fruit-producing region in the world. The semiconductor industry that would become Silicon Valley was just beginning to form, but the area’s identity was still agricultural. The transformation to a tech center took until the 1980s to become dominant.
