520 Area Code: Tucson, Arizona

Tucson sits at the heart of the 520 area code, in southern Arizona's Sonoran Desert basin between the Santa Catalina, Rincon, and Tucson mountain ranges. The city's character is shaped by that ring of peaks and the saguaro-studded uplands at their base, and by two long-running institutions — the University of Arizona, founded before statehood, and Davis-Monthan Air Force Base, with its widely photographed aircraft boneyard. The 520 footprint extends well beyond the metro into mining country, copper towns, and the borderland communities that line the highway south toward Nogales.

Phoenix-area cities and Yuma turn up in our records associated with 520 numbers — Glendale, Mesa, Phoenix, and Yuma being the most frequent. None of those are inside 520; the recurrence pattern reflects how phone numbers, addresses, and identity records move within Arizona without paying attention to area-code lines. The directory currently tracks 502 prefixes within 520 in detailed form, which functions as a lower bound on the prefixes actually allocated to the code.

A few demographic notes on Tucson itself. Household income runs notably below the US median, a pattern shaped in part by the city's large student population and a service-heavy local economy. Home values likewise sit under the national figure but are not severely so. The median age skews a touch younger than the country, and the city's population is large for the Southwest's smaller metros — comparable to other regional capitals across the desert states.