350 area code
Where the 350 area code is, its overlay and how to dial a +1 350 number from anywhere.
The 350 area code is in California, United States (Pacific (PT)). To call from abroad: +1 350 555-0123. It is an overlay, so all 10 digits are dialled.
The 350 area code is a geographic North American Numbering Plan (NANP) code covering California. It has been in service since 19-May-2022 and sits in the Pacific (PT) time zone.
How to dial a 350 number
+1 350 555-01231 350 555-0123350 555-0123Other California area codes
Frequently asked questions
Where is the 350 area code?
The 350 area code is in California, United States (Pacific (PT)).
Is 350 an overlay area code?
Yes. 350 overlays the same region as 209, so callers dial all 10 digits.
Do I have to dial 10 digits for 350?
Yes — dial the area code plus the seven-digit number.
How do I call a 350 number from another country?
Dial your exit code (or +), then 1, then 350, then the number: +1 350 555-0123.
Source: NANPA numbering plan. An area code covers a region, not a precise address — a 350 number does not pinpoint a street or ZIP code.
Number holders in area code 350
Each prefix (the three digits after the area code) is assigned by NANPA to one telephone company. 101 prefixes are in use in 350, shared by 20 companies. The largest holders:
| Company | Prefixes | Share |
|---|---|---|
| Onvoy, LLC | 20 | 20% |
| Onvoy Spectrum, LLC | 17 | 17% |
| New Cingular Wireless PCS, LLC | 12 | 12% |
| Multiple Ocn Listing | 9 | 9% |
| Commio, LLC | 7 | 7% |
| T-Mobile USA, Inc. | 7 | 7% |
Source: NANPA central office code assignments. A number keeps its original prefix when it is ported to another carrier.
Complaints about 350 numbers
- Reports to the FTC, last 30 days
- 39
- Recorded messages or robocalls
- 72%
- Rank among area codes
- #391 of 670
- Most reported subjects
- Other (14)
- Reducing your debt (credit cards, mortgage, student loans) (7)
- Calls pretending to be government, businesses, or family and friends (6)
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 350 — cities & rate centres