Area code 661 – California
661 has served California since 1999, split from 805. 674 of its 786 number blocks are allocated (86%). AT&T is the largest holder with 35.9% of blocks, ahead of Other CLEC / VoIP at 14.4%. FTC complaints naming a 661 caller ID totalled 648 in the 33 days to 30 October 2026 (160th of 422 ranked codes).
- State
- California
- In service since
- 1999
- Time zone
- Pacific
- Shares area with
- No overlay
Who holds 661 number blocks
Share of the 674 assigned NXX blocks (85.8% of the 786 possible), across 52 carriers. This is share of number blocks, not of subscribers.
- AT&T35.9%
- T-Mobile13.6%
- Other CLEC / VoIP10.1%
- Verizon8.8%
- Lumen8.3%
- Onvoy7.6%
- Bandwidth4.3%
- Frontier4.3%
- TPx2.1%
- Charter1.6%
- American Messaging0.7%
- Windstream0.6%
- Telnyx0.4%
- Peerless0.4%
- Vonage0.3%
- Dish0.3%
- Spok0.1%
- Twilio0.1%
- Comcast0.1%
- 8x80.1%
Spam complaints naming 661
FTC Do Not Call complaints where the caller ID was a 661 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 661
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 32.
Timeline
- 1999 661 goes into service, split from or overlaid on 805.
More about 661
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 661
What state is area code 661?
California.
Is a call from 661 a scam?
Not by itself. 661 drew 648 FTC complaints in the 33 days to 30 October 2026, 160th 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 661 numbers?
AT&T holds the largest share of assigned number blocks at 35.9%. 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 661?
No. NANPA records 661 as 7-digit dialing for local calls.
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: “7D”. Reviewed by the data desk. Spotted an error? Request a correction.