The 408 area code covers San Jose, Sunnyvale and 8 more places in California.
Area code 408 is in California, on Pacific Time. In the 408 area, phone numbers are given out most in Santa Clara County, then Monterey and San Benito counties. It has been in service since 1959. 669 covers the same area, so two neighbours can have different area codes.
- Where
- Santa Clara County, Monterey County and San Benito County, California
- Time zone
- Pacific Time
- In service since
- 1959
- Shares its area with
- 669 (since 2012)
- Prefixes in use
- 786
- How to dial
- Local calls need 1, then the area code, then the number: 1-408-555-0142.
Find out who called you from a 408 number.
Enter the full 10-digit number to see who it is listed to and the city and state on the listing. It is the same free check as our who called me lookup. To see only the caller ID name on the number, use our free CNAM lookup. To see whether it is a mobile, a landline or a VoIP line, use our free VoIP checker. To see which carrier a (408) number is on today, use our free carrier lookup.
Works for US & Canada numbers. Enter a 10-digit number, e.g. (415) 555-0132.
Free & rate-limited. No signup required to try.
San Jose holds 69% of the phone prefixes in area code 408.
A prefix is the three digits after the area code, and NANPA assigns each one to a town. Counting the 786 prefixes in use shows where 408 numbers are actually given out.
- San Jose544 prefixes, 69%
- Sunnyvale96 prefixes, 12%
- Campbell43 prefixes, 5%
- Los Gatos24 prefixes, 3%
- Morgan Hill19 prefixes, 2%
- Gilroy16 prefixes, 2%
- San Martin15 prefixes, 2%
- Saratoga15 prefixes, 2%
Also served: Salinas and Hollister.
Pacific Bell (AT&T) holds the most phone number prefixes in area code 408: 331 of 786.
NANPA, which runs the North American numbering plan, assigns each prefix (the three digits after the area code) to one carrier. Here is how the 786 prefixes in use in 408 divide between carriers; holders this page does not name are grouped as other carriers.
| Carrier | Prefixes | Share |
|---|---|---|
| Pacific Bell (AT&T)AT&T's landline company | 331 | 42% |
| AT&T MobilityMobile network | 70 | 9% |
| T-MobileMobile network | 42 | 5% |
| Level 3 (Lumen)Lumen's business and wholesale network | 40 | 5% |
| SpokPaging network | 27 | 3% |
| Teleport (AT&T)AT&T's business phone network | 21 | 3% |
| 18 other carriers | 255 | 32% |
56% of these prefixes are pooled, which means the blocks of 1,000 numbers inside them can belong to other carriers. Any number can also have been moved to another carrier since, so this shows who holds the prefixes, not who serves a given number.
Want the carrier of one exact number? Our free carrier lookup checks it, because numbers move between carriers.
Source: NANPA central office code assignments, October 1, 2026.
408 has been split once and overlaid once since 1959.
1959
408 starts, split off from 415.
1998
On July 11, 1998, 831 splits off and takes part of the 408 area.
2012
On November 20, 2012, 669 is added on top of 408, so new numbers here can get either code.
A 408 number on your screen can still be a scam, because caller ID is easy to fake.
- Let an unknown call go to voicemail. A real caller leaves a message; a robocaller usually does not.
- Look the number up with the box above before you call back, because calling back tells a robocaller your line is live.
- Hang up on anyone who wants gift cards, crypto or a wire transfer, or asks you to read out a code that was just texted to you.
- Report unwanted robocalls at reportfraud.ftc.gov, or paste a suspicious message into our free scam checker.
The area codes closest to 408 are 650, 510 and 925.
This list measures the distance between the centres of each area, across state lines, and shows codes that share one area together.
California has 40 other area codes.
These are the questions people ask most about area code 408.
Where is area code 408?
408 covers San Jose, Sunnyvale, Campbell and Los Gatos and 6 more places in California. In the 408 area, phone numbers are given out most in Santa Clara County, then Monterey and San Benito counties.
What state is area code 408 in?
California. 408 is a California area code on Pacific Time.
What cities use area code 408?
The places holding the most 408 prefixes are San Jose, Sunnyvale, Campbell, Los Gatos, Morgan Hill, Gilroy, San Martin and Saratoga, out of 10 places in all. The count comes from NANPA's prefix assignments as of October 1, 2026.
Which phone company owns area code 408?
No single phone company owns 408. NANPA's records show Pacific Bell (AT&T) holds the most 408 prefixes, 331 of 786, followed by AT&T Mobility and T-Mobile. Numbers move between carriers, so check one exact number with a carrier lookup.
What time zone is area code 408 in?
408 is on Pacific Time.
When did area code 408 start?
408 went into service in 1959, when it was split off from 415.
Is 408 the same area as 669?
Yes. 669 (since 2012) covers the same ground as 408. Nobody's number changed when it was added; new lines simply get whichever code has numbers left, so two neighbours can have different codes.
How do I dial a 408 number?
Local calls need 1, then the area code, then the number: 1-408-555-0142.
Is 408 a toll-free number?
No. 408 is a regular area code for San Jose and Sunnyvale in California, not a toll-free one. The toll-free codes in North America are 800, 833, 844, 855, 866, 877 and 888.
What area codes are near 408?
The closest are 650 (Palo Alto, California), 510/341 (Oakland, California), 925 (Walnut Creek, California) and 831 (Salinas, California), measured between the centres of each area.
Who called me from a 408 number?
Enter the full 10-digit number in the lookup above. It returns the listed owner where there is a public record, where the number is registered, and whether it is a mobile, a landline or a VoIP line.
Is area code 408 a scam?
408 is a real California area code, so the code itself is not a warning sign. Scam callers fake local-looking numbers on purpose, so judge the call by what the caller asks for, and look the number up before calling back.
Put this lookup on your site: our free area code widget takes two lines of code and shows any US area code's state, time zone and local time.
Source: NANPA, the North American Numbering Plan Administrator: its area code database and prefix assignments, as of October 1, 2026.