Geographic Regions and Area Codes

Area code 858 is located in the state of California and primarily serves San Diego County. The major cities within this area code include San Diego, Chula Vista, and El Cajon. The service area extends from the San Diego beach communities into La Jolla, Del Mar, and Solana Beach, and inland to Rancho Santa Fe, Rancho Bernardo, and Poway. This area code is an overlay of area code 619, meaning both codes serve the same geographic area. This overlay system helps manage the high demand for new phone numbers in the region.

Key regions within the 858 area code include:

  • San Diego
  • Chula Vista
  • El Cajon
  • La Jolla
  • Del Mar
  • Solana Beach
  • Rancho Santa Fe
  • Rancho Bernardo
  • Poway