California Phone Number Generator

This California phone number generator gives you 1 to 10 random numbers at a time, each one starting with a real California area code. Every number is written in the standard North American format, +1 (415) 555-0123 style, on a card labeled "California, United States of America" with a copy icon. The area code is picked from the 39 codes currently assigned to the state; the seven digits after it are random. Nothing is looked up against a directory, so the numbers are placeholders, not contacts.

What you can set

Just one thing: how many numbers you want, between 1 and 10. There's no area code picker on this page. Each number gets its area code drawn independently, so a batch of ten will usually mix Los Angeles, Bay Area, San Diego and Central Valley codes. If you need all ten to share one code, generate a larger batch and keep the ones you want, or copy a single card and change the prefix by hand.

How a California number is put together

California is inside the North American Numbering Plan, so every number is ten digits: a three-digit area code, a three-digit exchange (central office code) and a four-digit line number, with +1 as the country code for international dialing. The state has more area codes than any other in the US because it has more phone lines. The generator draws from this list:

• Los Angeles and the South Coast: 213, 323 (central LA), 310 and 424 (Westside, South Bay), 818 and 747 (San Fernando Valley), 562 (Long Beach), 626 (San Gabriel Valley), 661 (Santa Clarita, Bakersfield), 714 and 657 (northern Orange County), 949 (southern Orange County), 909 and 840 (Inland Empire), 951 (Riverside).
• San Diego and the desert: 619 (San Diego city), 858 (northern San Diego), 760 and 442 (Oceanside, Palm Springs, Imperial County).
• Bay Area: 415 and 628 (San Francisco, Marin), 510 and 341 (Oakland, East Bay), 925 (Contra Costa, Tri-Valley), 650 (Peninsula), 408 and 669 (San Jose, Silicon Valley), 707 and 369 (North Bay, Napa, Sonoma, Humboldt).
• Central Valley, coast and the north: 916 and 279 (Sacramento), 530 and 837 (Chico, Redding, Tahoe), 209 and 350 (Stockton, Modesto), 559 (Fresno), 831 (Monterey, Santa Cruz), 805 and 820 (Santa Barbara, San Luis Obispo, Ventura).

Pairs like 415/628 or 909/840 are overlays: a second code added on top of the same region once the first one filled up, which is why ten-digit dialing is required across the state. We added the recent overlays (279, 341, 350, 369, 820, 837 and 840) to the list so the output matches what a Californian would see on a caller ID today.

Why the numbers are safe to use as placeholders

The seven digits after the area code are random, which means most generated numbers do not correspond to any working line, and a few will produce combinations that carriers never assign (real exchange codes never start with 0 or 1, and 555-01XX is reserved for fiction). That is fine for the intended uses: filling a phone field in a signup form you're testing, seeding a CRM demo with California leads, giving a screenplay character a number, or checking that your app formats and validates a +1 number correctly. Don't dial the results, and don't put them on anything a customer might call.

Other numbers you may need

For a different state, see the Random Texas Phone Number, Colorado Phone Number Generator or Random New Jersey Phone Number Generator. For the same +1 format across the border, the Random Canada Phone Number Generator uses Canadian area codes. The Random UK Phone Number Generator and Random India Phone Number Generator cover the two most requested international formats. Everything by state and country is listed under all phone number generators.