Area Code | Region | UTC Offset | DST Observed | Description |
|---|
| 559 | CA | -8 | | Central California: Fresno (split from 209) |
| 562 | CA | -8 | | California: Long Beach (split from 310 Los Angeles) |
| 619 | CA | -8 | | S California: San Diego (see split 760; overlay 858, 935) |
| 626 | CA | -8 | | E S California: Pasadena (split from 818 Los Angeles) |
| 627 | CA | -8 | | Napa, Sonoma counties (perm 10/13/01, mand 04/13/02) |
| 628 | CA | -8 | | (Region unknown; perm 10/21/00) |
| 650 | CA | -8 | | California: Peninsula south of San Francisco -- San Mateo County, parts of Santa Clara County (split from 415) |
| 657 | CA | -8 | | California: North and Central Orange County (overlaid on 714; assigned but not in use) |
| 661 | CA | -8 | | California: N Los Angeles, Mckittrick, Mojave, Newhall, Oildale, Palmdale, Taft, Tehachapi, Bakersfield, Earlimart, Lancaster (split from 805) |
| 669 | CA | -8 | | Cent. Coastal California: San Jose (rejected was: overlaid on 408) |
| 707 | CA | -8 | | NW California: Santa Rosa, Napa, Vallejo, American Canyon, Fairfield |
| 714 | CA | -8 | | North and Central Orange County (see split 949; overlay 657) |
| 747 | CA | -8 | | S California: Los Angeles, Agoura Hills, Calabasas, Hidden Hills, and Westlake Village (see 818; implementation suspended) |
| 760 | CA | -8 | | California: San Diego North County to Sierra Nevada (split from 619) |
| 764 | CA | -8 | | (overlay on 650; SUSPENDED) |
| 805 | CA | -8 | | S Cent. and Cent. Coastal California: Ventura County, Santa Barbara County: San Luis Obispo, Thousand Oaks, Carpinteria, Santa Barbara, Santa Maria, Lompoc, Santa Ynez Valley / Solvang (see 661 split) |
| 818 | CA | -8 | | S California: Los Angeles: San Fernando Valley (see 213, 310, 562, 626, 747) |
| 831 | CA | -8 | | California: central coast area from Santa Cruz through Monterey County |
| 858 | CA | -8 | | S California: San Diego (see split 760; overlay 619, 935) |
| 909 | CA | -8 | | California: Inland empire: San Bernardino (see split 951), Riverside |
| 916 | CA | -8 | | NE California: Sacramento, Walnut Grove, Lincoln, Newcastle and El Dorado Hills (split to 530) |
| 925 | CA | -8 | | California: Contra Costa area: Antioch, Concord, Pleasanton, Walnut Creek (split from 510) |
| 935 | CA | -8 | | S California: San Diego (see split 760; overlay 858, 619; assigned but not in use) |
| 949 | CA | -8 | | California: S Coastal Orange County (split from 714) |
| 951 | CA | -8 | | California: W Riverside County (split from 909; eff 7/17/04) |
| 303 | CO | -7 | | Central Colorado: Denver (see 970, also 720 overlay) |
| 719 | CO | -7 | | SE Colorado: Pueblo, Colorado Springs |
| 720 | CO | -7 | | Central Colorado: Denver (overlaid on 303) |
| 970 | CO | -7 | | N and W Colorado (part of what used to be 303) |
| 203 | CT | -5 | | Connecticut: Fairfield County and New Haven County; Bridgeport, New Haven (see 860) |
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