Area code 840 – California
840 has served California since 2021, split from 909. It is still largely empty: 130 of 786 number blocks allocated. No carrier dominates: Other CLEC / VoIP 26.2%, T-Mobile 24.6%, Onvoy / Inteliquent 17.7%. It shares its geography with overlay codes 909, so local calls take all ten digits. Spam complaints are comparatively rare: 137 in the 33 days to 30 October 2026, 366th of the 422 codes with five or more complaints.
- State
- California
- In service since
- 2021
- Time zone
- Pacific
- Shares area with
- 909
Who holds 840 number blocks
Share of the 130 assigned NXX blocks (16.5% of the 786 possible), across 15 carriers. This is share of number blocks, not of subscribers.
- Other CLEC / VoIP25.4%
- T-Mobile24.6%
- Onvoy17.7%
- AT&T14.6%
- Verizon10.8%
- Bandwidth3.1%
- Charter2.3%
- Dish0.8%
- Vonage0.8%
Spam complaints naming 840
FTC Do Not Call complaints where the caller ID was a 840 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 840
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 19.
Timeline
- 2021 840 goes into service, split from or overlaid on 909.
More about 840
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 840
What state is area code 840?
California. It covers the same area as 840/909.
Is a call from 840 a scam?
Not by itself. 840 drew 137 FTC complaints in the 33 days to 30 October 2026, 366th 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 840 numbers?
Other CLEC / VoIP holds the largest share of assigned number blocks at 26.2%. 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 840?
NANPA records the local dialing plan for 840 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.