408 area code
Where the 408 area code is, its overlay and how to dial a +1 408 number from anywhere.
The 408 area code is in Campbell, California, United States (Pacific (PT)). To call from abroad: +1 408 555-0123. It is an overlay, so all 10 digits are dialled.
The 408 area code is a geographic North American Numbering Plan (NANP) code covering Campbell, California. It has been in service since 01-Jan-1959 and sits in the Pacific (PT) time zone.
How to dial a 408 number
+1 408 555-01231 408 555-0123408 555-0123Cities in the 408 area code
A 408 number is usually in one of these places in California — 2 counties.
Other California area codes
Frequently asked questions
Where is the 408 area code?
The 408 area code is in Campbell, California, United States (Pacific (PT)).
Is 408 an overlay area code?
Yes. 408 overlays the same region as 415, 669, so callers dial all 10 digits.
Do I have to dial 10 digits for 408?
Yes — dial the area code plus the seven-digit number.
How do I call a 408 number from another country?
Dial your exit code (or +), then 1, then 408, then the number: +1 408 555-0123.
Source: NANPA numbering plan. An area code covers a region, not a precise address — a 408 number does not pinpoint a street or ZIP code.
Number holders in area code 408
Each prefix (the three digits after the area code) is assigned by NANPA to one telephone company. 800 prefixes are in use in 408, shared by 31 companies. The largest holders:
| Company | Prefixes | Share |
|---|---|---|
| Pacific Bell | 328 | 41% |
| New Cingular Wireless PCS, LLC | 70 | 9% |
| Cellco Partnership Dba Verizon Wireless | 65 | 8% |
| T-Mobile USA, Inc. | 42 | 5% |
| Mcimetro Access Transmission Services LLC | 39 | 5% |
| Onvoy, LLC | 35 | 4% |
Source: NANPA central office code assignments. A number keeps its original prefix when it is ported to another carrier.
Complaints about 408 numbers
- Reports to the FTC, last 30 days
- 516
- Recorded messages or robocalls
- 66%
- Rank among area codes
- #190 of 670
- Most reported subjects
- Other (218)
- Reducing your debt (credit cards, mortgage, student loans) (88)
- Dropped call or no message (59)
Period Aug 26 – Sep 24, 2026. These are the numbers shown on the caller ID of the reported calls; many are spoofed and do not belong to the real caller.
Source: US Federal Trade Commission, Do Not Call reported calls data (daily files).
All US area codes United States +1 Map of area code 408 — cities & rate centres