NumberingData
Methodology Download the data
Area code Verified Nov 1, 2026 · Source: NANPA

Area code 323 – California

323 has served California since 1998, split from 213. All but a handful of its 786 number blocks are allocated (786 of 786), so it is effectively exhausted. AT&T is the largest holder with 41.6% of blocks, ahead of Verizon at 12.3%. It shares its geography with overlay codes 213, 738, so local calls take all ten digits. 677 FTC complaints named a 323 caller ID in the 33 days to 30 October 2026, putting it 142nd of 422 codes with five or more complaints.

State
California
In service since
1998
Time zone
Pacific
Shares area with
213, 738

Who holds 323 number blocks

Share of the 786 assigned NXX blocks (100% of the 786 possible), across 30 carriers. This is share of number blocks, not of subscribers.

  • AT&T41.6%
  • T-Mobile19%
  • Verizon12.3%
  • Lumen6.1%
  • Bandwidth4.8%
  • TPx4.7%
  • Onvoy3.2%
  • Other CLEC / VoIP2.9%
  • Windstream1.5%
  • Charter1.1%
  • Spok0.9%
  • American Messaging0.8%
  • Peerless0.8%
  • Frontier0.3%

Spam complaints naming 323

FTC Do Not Call complaints where the caller ID was a 323 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.

677 complaints in 33 days
#142 of 422 ranked codes

Rate centers in 323

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 12.

LSAN DA 14160
MONTEBELLO110
LSAN DA 0680
LSAN DA 0972
LSAN DA 1370

Timeline

  1. 1998 323 goes into service, split from or overlaid on 213.

More about 323

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.

All prefixes Every one of the 786 assigned NXX blocks, with the holder of each Local time Zone, UTC offset, clock changes and a live clock Spam complaints How often the code appears in FTC complaints, and what to do Carriers Who holds the number blocks, and why that is not who serves them 323 vs 213 Same area, different code – age, capacity and complaints side by side 323 vs 738 Same area, different code – age, capacity and complaints side by side

Frequently asked about 323

What state is area code 323?

California. It covers the same area as 213/323/738.

Can I still get a 323 number?

Only from recycled stock. 786 of the 786 available blocks are already allocated, so new numbers in the area normally come from the overlay codes (213/323/738).

Is a call from 323 a scam?

Not by itself. 323 drew 677 FTC complaints in the 33 days to 30 October 2026, 142nd 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 323 numbers?

AT&T holds the largest share of assigned number blocks at 41.6%. 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 323?

NANPA records the local dialing plan for 323 as “1+10D”.

Sources and verification

NANPA dialing note for this code: “1+10D”. Reviewed by the data desk. Spotted an error? Request a correction.

Nearby and related

213 California213 California738 California