858 Area Code — San Diego, CA
Area code 858 serves San Diego and 3 other cities in California. Local time follows America/Los_Angeles. It has no overlay codes.
- State
- California
- Primary city
- San Diego
- Timezone
- America/Los_Angeles
- In service since
- 1999
- Type
- Geographic
- Overlay codes
- None
Cities Served by 858
The 858 area code covers 4 cities and communities in California.
- San Diego
- La Jolla
- Poway
- Del Mar
About Area Code 858
Area code 858 is a North American Numbering Plan (NANP) area code that has been in service since 1999. It is administered by NANPA on behalf of the FCC and serves the California region anchored on San Diego.
858 is currently a single-coverage geographic area code with no overlays. This means a 7-digit number in this area code is unique within its rate centers, though best-practice is always to dial the full 10-digit number when contacting a 858 line.
Mobile numbers in 858 are portable: a person who moved away from San Diego may still carry a 858 mobile number on their device. If you receive an unexpected call from a 858 number, run it through the reverse lookup tool above for the most accurate, free identification.
If you live or do business in California, you may also interact with neighbouring or overlay codes. See the related codes section below to explore the rest of California.
Other California Area Codes
Continue exploring the California numbering plan.
858 Area Code FAQ
Where is area code 858?
Area code 858 is located in California, primarily serving San Diego and surrounding cities including La Jolla, Poway, Del Mar. The region operates on PT (America/Los_Angeles) time.
What state is 858 area code?
858 is a California area code. It was put into service in 1999 and has no overlay codes — it covers its geographic area exclusively.
Is 858 a scam area code?
858 is a legitimate North American area code allocated by NANPA to California. Like any geographic area code, scammers sometimes spoof 858 numbers — judge each call by content (urgent demands, unfamiliar transfers) rather than the area code alone. Run the specific number through our reverse lookup if you're unsure.
What time zone does 858 use?
Area code 858 operates on PT (America/Los_Angeles). Numbers in this area code follow standard California time-zone rules including any daylight-saving transitions for that region.
Can I look up a specific 858 phone number?
Yes. Use the reverse lookup widget above to enter a full 858 number. NumLocation returns the line type (mobile, landline, VoIP), carrier, rate-center city, and any public listings tied to the number — free.