--- title: "Area code 424: California, United States" url: "https://lookvalid.com/area-code/424.md" canonical_url: "https://lookvalid.com/area-code/424" last_updated: "2026-10-23" type: "reference" summary: "Area code 424 serves California, United States. Number formats, numbering rules, a live phone validator and the other codes in California." --- # Area code 424: California, United States Area code 424 serves California, United States. Number formats, numbering rules, a live phone validator and the other codes in California. NANPA lists 451 central office codes (prefixes) in use in area code 424, held by 26 holders across 16 rate centers. T-Mobile USA holds the most prefixes, 74 (16%). 100% of the prefixes are pooled, which means their thousands-blocks can belong to different companies. The FCC unwanted-call data has 2,506 complaints on file for 1,705 numbers in 424, most often filed as "Unwanted Calls". These are consumer reports, not findings. ## Facts - In service since: 2006-08-26 - Time zone: Pacific (P) - Assigned overlays: 310 (1991-11-02) - Prefixes in use: 451 - Pooled prefixes: 449 (100%) - Rate centers: 16 - Companies holding prefixes: 26 - Assignment dates on file: 2006-03-16 to 2026-08-11 (399 prefixes) - ZIP codes in its places: 38 ## Rate centers | Rate center | Prefixes | Share | | --- | --- | --- | | BEVERLYHLS | 62 | 14% | | INGLEWOOD | 38 | 8% | | REDONDO | 37 | 8% | | CMTN CMTN | 35 | 8% | | SNMN SNMN | 35 | 8% | | W ANGELES | 35 | 8% | | CMTN GRDN | 32 | 7% | | SAN PEDRO | 31 | 7% | | 8 other rate centers | 146 | 32% | ## Carriers | Holder | Prefixes | Share | | --- | --- | --- | | T-Mobile USA | 74 | 16% | | Onvoy | 62 | 14% | | Bandwidth.com CLEC | 45 | 10% | | Level 3 Communications | 42 | 9% | | New Cingular Wireless PCS | 35 | 8% | | Fractel | 33 | 7% | | 20 other carriers | 160 | 35% | 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. ## History - 1991-11-02: Area code 310, named as the parent of 424 in the NANPA report, was in service. - 2006-08-26: Area code 424 went into service. ## Nearest area codes The area codes closest to 424, measured between the centers of the ZIP code places they serve, are 562 (about 14 miles), 747 (about 22 miles), 818 (about 22 miles), 626 (about 25 miles) and 657 (about 28 miles). ## ZIP codes 38 ZIP codes fall in places that have a rate center in this area code. The places with the most are Inglewood, CA (12 ZIP codes), Torrance, CA (10 ZIP codes) and Culver City, CA (4 ZIP codes). A ZIP code and an area code are unrelated systems, so a ZIP code can sit in more than one area code and an area code spans many ZIP codes. ## Complaints on file 2,506 complaints for 1,705 numbers. Numbers whose latest complaint falls in each year: - 2023: 157 - 2024: 129 - 2025: 95 ## Questions ### Where is area code 424? NANPA assigns area code 424 to California, United States. ### In which state does area code 424 sit? California. 424 is one of 41 area codes the NANPA table assigns to the state. ### Which places does area code 424 cover? The places with the most ZIP codes among the rate centers in 424 are Inglewood, CA, Torrance, CA and Culver City, CA. The rate center list on this page shows all of them. ### Who owns area code 424? NANPA assigns area codes. Within 424, T-Mobile USA holds the most prefixes, 74 prefixes or 16%. ### Which time zone does 424 use? The NANPA NPA report lists the time zone for 424 as Pacific (P). ### What year did 424 enter service? The NANPA NPA report gives an in-service date of 2006-08-26, so 424 has been in use since 2006. ### Does area code 424 have an overlay? Yes. 310 (in service 1991-11-02) shares the same area with 424, so numbers from all of them are local to each other. ### Which area codes are nearest to 424? The area codes closest to 424, measured between the centers of the ZIP code places they serve, are 562 (about 14 miles), 747 (about 22 miles), 818 (about 22 miles), 626 (about 25 miles) and 657 (about 28 miles). ### How many prefixes does area code 424 have? NANPA's report dated 2026-10-17 lists 451 prefixes in service in 424, spread over 16 rate centers and 26 holders. ### Are there complaints about 424 numbers? The FCC data on file has 2,506 complaints for 1,705 numbers in 424. They are unverified consumer reports. A number with no complaints on file is not proven safe. Sources: NANPA central office code report dated 2026-10-17; NANPA NPA report dated 2026-10-18; FCC unwanted-call complaints, data fetched 2026-10-17; ZIP code places from GeoNames (CC BY 4.0).