Geographic Regions and Area Codes in Area Code 369

Area code 369 is a newly introduced overlay area code in Northern California, specifically designed to address the growing demand for new phone numbers in the region. This area code covers a significant portion of northwestern California, including parts of the San Francisco Bay Area and the North Coast. The counties served by this area code include:

  • Del Norte
  • Glenn
  • Humboldt
  • Lake
  • Marin
  • Mendocino
  • Napa
  • Solano
  • Sonoma
  • Tehama
  • Trinity

Major cities within this area code include Napa, Santa Rosa, Fairfield, Vallejo, Windsor, Crescent City, and Vacaville. The 369 area code is an overlay of the existing 707 area code, which means it serves the same geographic regions without changing the existing numbers.