Area code
323
323 is a United States area code. Under the North American Numbering Plan it belongs to California, which has 41 area codes in total.
Validate a number in 323
Paste a full number and the tool checks it against the numbering plan. It returns the standard formats, the line type the plan assigns and the area code region.
Digits with or without punctuation work. Numbers outside the US are read with the +country code.
Area code 323 at a glance
NANPA lists 786 central office codes (prefixes) in use in area code 323, held by 29 holders across 12 rate centers.
| Fact | Value |
|---|---|
| In service since | 1998-06-13 |
| Time zone | Pacific (P) |
| Assigned overlays | 213 (1947-01-01), 738 (2024-11-01) |
| Prefixes in use | 786 |
| Pooled prefixes | 524 (67%) |
| Rate centers | 12 |
| Companies holding prefixes | 29 |
| Assignment dates on file | 2001-01-23 to 2025-04-02 (236 prefixes) |
Rate centers in area code 323
| Rate center | Prefixes | Share |
|---|---|---|
| LSAN DA 14 | 160 | 20% |
| MONTEBELLO | 110 | 14% |
| LSAN DA 06 | 80 | 10% |
| LSAN DA 09 | 72 | 9% |
| LSAN DA 13 | 70 | 9% |
| LSAN DA 02 | 57 | 7% |
| LSAN DA 03 | 56 | 7% |
| LSAN DA 05 | 45 | 6% |
| 4 other rate centers | 136 | 17% |
Who holds the prefixes in 323
Pacific Bell holds the most prefixes, 265 (34%). 67% of the prefixes are pooled, which means their thousands-blocks can belong to different companies.
| Holder | Prefixes | Share |
|---|---|---|
| Pacific Bell | 265 | 34% |
| Metropcs Networks | 85 | 11% |
| T-Mobile USA | 64 | 8% |
| Mcimetro Access Transmission Services | 52 | 7% |
| Verizon Wireless | 45 | 6% |
| New Cingular Wireless PCS | 39 | 5% |
| 23 other carriers | 236 | 30% |
A prefix holder is the company a code was assigned to, not necessarily a number's current carrier, because numbers can be ported to another company. Find which carrier a number is on, or browse the prefix holders.
History of area code 323
- 1947-01-01 Area code 213, named as the parent of 323 in the NANPA report, was in service.
- 1998-06-13 Area code 323 went into service.
- 2024-11-01 Area code 738 went into service as an overlay in the same area as 323.
Complaints on file for 323 numbers
6,325 FCC complaints are on file for 4,219 numbers in 323, most often filed as "Unwanted Calls". These are unverified consumer reports.
| Year of latest complaint | Numbers |
|---|---|
| 2023 | 216 |
| 2024 | 225 |
| 2025 | 137 |
Other area codes in California
California is one state with 41 area codes in the NANPA table. 323 is one of them.
- 209
- 213
- 279
- 310
- 341
- 350
- 357
- 369
- 408
- 415
- 424
- 442
- 510
- 530
- 559
- 562
- 619
- 626
- 628
- 650
- 657
- 661
- 669
- 707
- 714
- 738
- 747
- 760
- 805
- 818
- 820
- 831
- 837
- 840
- 858
- 909
- 916
- 925
- 949
- 951
Next to 323 in the numbering table
These are the codes just before and after 323 when all are sorted by number. They are neighbours on the list, not necessarily on the map.
What the area code does and does not tell you
A number that starts with 323 was first assigned in California. That is a fact about where the number began, and it is a useful hint when you check a form entry, for example a billing address in California next to a 323 phone number.
It does not show where the person is today. A number stays with its owner after a move or a change of provider (number portability), and mobile numbers travel with the handset. The area code also cannot tell you whether the line is active, who the carrier is, or whether the number is mobile or fixed: the plan shares those ranges. Read more about the area code, the numbering plan and line type.
Check numbers in bulk with the API
| Product | Credits | Docs |
|---|---|---|
| Phone Numbering-Plan Validation | 1 credit per valid number | API docs |
| Phone Intelligence (carrier and line status) | 1 credit per check (invalid numbers outside the US and Canada are free) | Product page |
Questions about area code 323
Where is area code 323?
NANPA assigns area code 323 to California, United States.
In which state does area code 323 sit?
California. 323 is one of 41 area codes the NANPA table assigns to the state.
Who owns area code 323?
NANPA assigns area codes. Within 323, Pacific Bell holds the most prefixes, 265 prefixes or 34%.
Which time zone does 323 use?
The NANPA NPA report lists the time zone for 323 as Pacific (P).
What year did 323 enter service?
The NANPA NPA report gives an in-service date of 1998-06-13, so 323 has been in use since 1998.
Does area code 323 have an overlay?
Yes. 213 (in service 1947-01-01) and 738 (in service 2024-11-01) share the same area with 323, so numbers from all of them are local to each other.
How many prefixes does area code 323 have?
NANPA's report dated 2026-10-17 lists 786 prefixes in service in 323, spread over 12 rate centers and 29 holders.
Are there complaints about 323 numbers?
The FCC data on file has 6,325 complaints for 4,219 numbers in 323. They are unverified consumer reports. A number with no complaints on file is not proven safe.
Area code assignments: North American Numbering Plan Administrator NPA report, file dated 10/17/2026, retrieved 2026-10-17. Source file. New codes are assigned several times a year. Prefixes, rate centers, holders, time zone, in-service date and overlays: NANPA central office code report dated 2026-10-17 and NPA report dated 2026-10-18. Complaints: FCC consumer complaints open data, fetched 2026-10-17. ZIP code places: Postal code places and coordinates: GeoNames (geonames.org), licensed CC BY 4.0.