The area code 520 is located in Casas Adobes, Arizona.
Area code 520 serves Casas Adobes, Arizona, and much of southern Arizona, centered on the Tucson metro area. Casas Adobes sits in northwest Tucson, near the foothills of the Santa Catalina Mountains, and the code connects this community with nearby suburbs, border towns, and military and university centers. It covers key parts of Pima, Santa Cruz, and Cochise counties, tying together everyday life, business, and tourism across the region.
Established: 1995 (split from 602); northern/western areas split again in 2001 to create 928 — Source: North American Numbering Plan Administration (NANPA)
Major cities and communities in the 520 area code include:
This Arizona area code covers landmarks like the University of Arizona, Saguaro National Park, the Arizona-Sonora Desert Museum, and Tohono Chul in Casas Adobes. The name “Casas Adobes” means “adobe houses,” a nod to the region’s desert architecture and history. With strong ties to cross-border trade in Nogales and defense activity at Fort Huachuca, 520 phone numbers link a diverse mix of communities and industries. Whether you’re in Tucson’s urban core or the Catalina foothills, the 520 area code is the primary identifier for local phone numbers across southern Arizona.