Geographic Coverage & Key Cities

The 559 area code covers California's Central Valley, stretching across six counties: Fresno, Tulare, Kings, Madera, Merced, and Mariposa. This region comprises 63 cities with approximately 3.2 million residents, making it one of California's most productive and economically diverse areas. On March 26, 2025, the new 357 area code was introduced to meet growing demand, requiring 10-digit dialing while existing numbers keep the 559 designation.

The region's economy extends beyond farming, with healthcare networks serving rural communities, logistics managing agricultural supply chains, food processing facilities, and institutions like Fresno State preparing future leaders. Businesses expanding across California's agricultural regions can maintain local presence in multiple areas and leverage AI phone services in San Francisco to centralize operations.

Key Economic Zones & Business Hubs

  • Major Cities: Fresno (economic hub and agricultural distribution center), Visalia (dairy and citrus production leader), Clovis (technology and logistics center), Hanford (food processing specialization), Madera (gateway to Sierra Nevada foothills with wine country connections)
  • Economic Zones: Agricultural production areas, food processing districts, healthcare networks, technology corridors, logistics centers
  • Business Hubs: Fresno State University district, Central Valley agricultural distribution centers, rural healthcare networks
  • Neighboring Area Codes: 357 (new overlay), 209 (northern Central Valley), 661 (Bakersfield/southern Central Valley), 831 (Monterey Bay)
  • Strategic Industries: Agriculture and farming, food processing, healthcare systems, logistics and transportation, agricultural technology, veterinary services