Area Code 424: California, California
424 is a telephone area code serving California. It is part of the North American Numbering Plan and is dialed with the country code +1.
Numbers beginning with 424 are located in California, United States (NANP region: LA).
How to Dial Area Code 424
| Calling from | What to dial |
|---|---|
| Anywhere in the US or Canada | 1 424 XXX-XXXX (10-digit dialing: 424 + 7-digit number) |
| Local call inside the same area code | 7-digit number in most areas; 10 digits where an overlay code is active |
| From the UK or Europe | 00 1 424 XXX XXXX |
| From Australia | 0011 1 424 XXX XXXX |
| From a mobile phone anywhere | +1 424 XXX XXXX |
Whatever country you are calling from, the + symbol replaces the exit code. Save the contact as +1 424 XXXXXXX and it will dial correctly from any phone in the world.
Time Zone for Area Code 424
Calls to a 424 number ring in the America/Los_Angeles time zone, standard offset UTC-08:00. Daylight saving time applies here, so the offset moves forward one hour from March to November.
Other Area Codes in California
These codes also serve California. Area codes are assigned by the North American Numbering Plan Administration (NANPA).
| Area Code | Cities / Coverage |
|---|---|
| 209 | Stockton, Modesto |
| 213 | Los Angeles (downtown) |
| 279 | Sacramento (overlay) |
| 310 | Los Angeles Westside, Santa Monica |
| 323 | Los Angeles (central) |
| 341 | Oakland (overlay) |
| 350 | Stockton (overlay) |
| 369 | North Bay (overlay for 707) |
| 408 | San Jose, Silicon Valley |
| 415 | San Francisco |
| 442 | Palm Springs (overlay) |
| 510 | Oakland, Berkeley |
| 530 | Redding, Chico |
| 559 | Fresno |
See all 38 area codes in California →
Frequently Asked Questions
Where is area code 424?
Area code 424 is in California, United States. It covers LA Westside (overlay).
What time zone is area code 424 in?
Area code 424 rings in the America/Los_Angeles time zone (UTC-08:00 standard).
Do I need to dial 1 before area code 424?
Yes, for a long-distance call inside the US and Canada you dial 1 first, then 424, then the seven-digit number. The 1 is the North American long-distance trunk prefix — it is not the country code. From outside North America you dial your exit code then 1 then 424.
Is area code 424 toll-free?
No. 424 is a standard geographic area code, so normal long-distance rates apply unless your plan includes them. Toll-free NANP codes are 800, 833, 844, 855, 866, 877 and 888.