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All Area Codes/California
858

San Diego, California

Area code 858

State
California
Region
Pacific
Time zone
PT
Type
Geographic
--:--local time

Got a missed call from 858?

Our directory lists 858 for San Diego, California, but an area code alone cannot establish who is calling. Scammers can fake caller ID to match the first six digits of the number they are dialing, a trick called neighbor spoofing, so a familiar-looking code proves nothing about who is really calling.

If you were not expecting the call, let it go to voicemail. Verify the caller through a trusted contact method before returning the call, and never share personal details with an unverified caller.

Worth knowing: an area code no longer tells you where someone is. Mobile numbers keep their original code when people move, so a 858 number may belong to someone who left California years ago.

Frequently asked questions about 858

Where is area code 858?

Our directory lists area code 858 for San Diego, California. The listed city is a reference location, not a complete coverage map. A phone number's area code does not establish the caller's current location.

What time zone is area code 858 in?

This directory uses Pacific Time (PT) for California. This is state-level guidance; confirm the recipient's local time before calling.

Is area code 858 a scam?

An area code alone cannot tell you whether a call is genuine. Caller ID can be spoofed, including numbers that appear local. Let unexpected calls go to voicemail and verify the caller independently before sharing personal information.

Is area code 858 toll-free?

The directory lists 858 as a geographic area code, not a toll-free code. US toll-free codes include 800, 833, 844, 855, 866, 877, and 888. Your carrier and calling plan determine any charges.

37 listed area codes in California

209 Lodi213 Los Angeles279 Arden-Arcade310 Los Angeles323 Los Angeles341 Oakland369 Santa Rosa408 Gilroy415 San Francisco424 Beverly Hills442 Apple Valley510 Alameda530 Chico559 Clovis562 Bellflower619 Chula Vista626 Alhambra627 Santa Rosa628 San Francisco650 Daly City657 Anaheim661 Earlimart669 San Jose707 Benicia714 Anaheim747 Burbank760 Apple Valley805 Camarillo818 Agoura Hills820 Camarillo831 Salinas909 Anaheim916 Elk Grove925 Antioch949 Costa Mesa951 Corona

Nearby in the Pacific

206 Seattle253 Kent360 Bellingham425 Bellevue458 Eugene503 Beaver509 Kennewick541 Bend564 Seattle808 Honolulu

Where Is Area Code 858?

Area code 858 serves part of San Diego County in Southern California, with the city of San Diego as its primary city. Its original geographic area centered on northern San Diego and nearby places such as Poway, Del Mar, and Solana Beach. The region includes Pacific coast neighborhoods and inland communities east of the city.

Since 2018, 858 has shared a geographic service area with 619. The combined area includes communities historically assigned to either code in central and southern San Diego County. A person in that shared area may have either code, so the area code alone no longer marks a north-versus-south boundary. Area code 858 does not cover all of San Diego County. Some communities farther north and east use 760 or 442.

Notable places in the original 858 area include UC San Diego in La Jolla, La Jolla Cove, and Torrey Pines State Natural Reserve. Torrey Pines State Beach runs along the coast below the reserve’s sandstone bluffs. These landmarks sit near coastal communities, canyons, and San Diego’s inland neighborhoods.

Cities and Communities in the 858 Area Code

  • San Diego, San Diego County
  • Poway, San Diego County
  • Del Mar, San Diego County
  • Solana Beach, San Diego County

History of Area Code 858

Area code 858 began service on June 12, 1999, when it split from 619. Before the split, 619 covered a larger part of the San Diego region. The new code separated northern San Diego communities from the existing 619 territory and added numbering capacity as demand for phone numbers grew.

The change followed an earlier adjustment: area code 760 split from 619 in 1997 to serve areas north and east of San Diego. In 2018, 619 and 858 became overlay codes across the same geographic service area. The overlay ended the old boundary between the two codes, and local callers had to dial all 10 digits, including the area code.

Key Facts About Area Code 858

  • Area code 858 is a geographic area code in California, and San Diego is its primary city.
  • Area code 858 follows Pacific Time.
  • Area code 858 began service on June 12, 1999, after splitting from area code 619.
  • Area code 858 originally covered northern San Diego and nearby communities, including Poway, Del Mar, and Solana Beach.
  • Since 2018, area codes 858 and 619 have shared a geographic service area in San Diego County.
  • The 619/858 overlay requires 10-digit dialing for local calls in the shared area.
  • UC San Diego’s main campus is in La Jolla, within the original 858 area.
  • Torrey Pines State Natural Reserve is on the San Diego coast within the original 858 area.