Area code 350 – California
350 has served California since 2022, split from 209. It is still largely empty: 88 of 786 number blocks allocated. No carrier dominates: Other CLEC / VoIP 22.7%, Onvoy / Inteliquent 22.7%, Charter / Spectrum 19.3%. It shares its geography with overlay codes 209, so local calls take all ten digits. Spam complaints are comparatively rare: 54 in the 33 days to 30 October 2026, 384th of the 422 codes with five or more complaints.
- State
- California
- In service since
- 2022
- Time zone
- Pacific
- Shares area with
- 209
Who holds 350 number blocks
Share of the 88 assigned NXX blocks (11.2% of the 786 possible), across 17 carriers. This is share of number blocks, not of subscribers.
- Onvoy22.7%
- Other CLEC / VoIP20.5%
- Charter19.3%
- AT&T17%
- T-Mobile8%
- Verizon5.7%
- Comcast2.3%
- Bandwidth1.1%
- Peerless1.1%
- Dish1.1%
- 8x81.1%
Spam complaints naming 350
FTC Do Not Call complaints where the caller ID was a 350 number, 28 Sep – 30 Oct 2026 (33 days). Caller IDs on spam calls are frequently spoofed, so these are complaints about the code, not calls proven to originate in it.
Rate centers in 350
NANPA allocates number blocks to rate centers and records their names abbreviated to ten characters, so these are NANPA's codes rather than place names – CHAMPAURBN is Champaign-Urbana, NWYRCYZN01 is a New York City zone. We show them unchanged instead of guessing at the full names. Showing the largest 5 of 41.
Timeline
- 2022 350 goes into service, split from or overlaid on 209.
More about 350
Separate pages for the questions that need their own answer: what time it is there, what the complaint data says, who holds the number blocks, and how the code compares with the one it shares its area with.
Frequently asked about 350
What state is area code 350?
California. It covers the same area as 209/350.
Is a call from 350 a scam?
Not by itself. 350 drew 54 FTC complaints in the 33 days to 30 October 2026, 384th of 422 ranked codes – mid-pack or lower. Spam callers spoof caller IDs, so the only useful check is the full number.
Which carrier owns 350 numbers?
Other CLEC / VoIP holds the largest share of assigned number blocks at 22.7%. The rest is spread across 3 other carriers. This is share of number blocks, not of subscribers – people keep their numbers when they switch carriers.
Do I need to dial 10 digits in 350?
NANPA records the local dialing plan for 350 as “1+10D”.
Sources and verification
- NANPA – NPA Database (npa_report.csv), file date 11/01/2026, retrieved Nov 1, 2026
- NANPA – CO Code Assignment Records, All States (utilized), file updated 11/01/2026, retrieved Nov 1, 2026
- FTC – Do Not Call Reported Calls Data, 25 daily files 28 Sep – 30 Oct 2026, retrieved Nov 1, 2026
NANPA dialing note for this code: “1+10D”. Reviewed by the data desk. Spotted an error? Request a correction.