Area code 559 – California
559 has served California since 1998, split from 209. All but a handful of its 786 number blocks are allocated (785 of 786), so it is effectively exhausted. AT&T is the largest holder with 41.0% of blocks, ahead of Other CLEC / VoIP at 13.2%. It shares its geography with overlay codes 357, so local calls take all ten digits. 698 FTC complaints named a 559 caller ID in the 33 days to 30 October 2026, putting it 131st of 422 codes with five or more complaints.
- State
- California
- In service since
- 1998
- Time zone
- Pacific
- Shares area with
- 357
Who holds 559 number blocks
Share of the 785 assigned NXX blocks (99.9% of the 786 possible), across 47 carriers. This is share of number blocks, not of subscribers.
- AT&T41%
- T-Mobile10.1%
- Other CLEC / VoIP9.6%
- Lumen9.2%
- Verizon7.4%
- Onvoy7.1%
- Bandwidth4.6%
- Frontier2.8%
- TPx2.2%
- Comcast1.7%
- American Messaging1%
- Charter1%
- Peerless0.9%
- Dish0.6%
- Telnyx0.4%
- Twilio0.3%
- Vonage0.1%
- 8x80.1%
Spam complaints naming 559
FTC Do Not Call complaints where the caller ID was a 559 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 559
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 60.
Timeline
- 1998 559 goes into service, split from or overlaid on 209.
More about 559
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 559
What state is area code 559?
California. It covers the same area as 357/559.
Can I still get a 559 number?
Only from recycled stock. 785 of the 786 available blocks are already allocated, so new numbers in the area normally come from the overlay codes (357/559).
Is a call from 559 a scam?
Not by itself. 559 drew 698 FTC complaints in the 33 days to 30 October 2026, 131st 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 559 numbers?
AT&T holds the largest share of assigned number blocks at 41.0%. 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 559?
NANPA records the local dialing plan for 559 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.