Casas Adobes, Arizona

Where Is Area Code 520?

Area code 520 is in southeastern and southern Arizona. It serves Casas Adobes, Tucson, Nogales, Sierra Vista, Douglas, Green Valley, and other communities outside the Phoenix and Prescott areas. Casas Adobes is an unincorporated community in Pima County, just northwest of Tucson.

Area code 520 covers much of Pima County and also reaches into several nearby counties in southern and southeastern Arizona. It includes communities near the U.S.-Mexico border and parts of the Sonoran Desert. The area includes well-known places such as Saguaro National Park near Tucson and border crossings at Nogales and Douglas.

Tucson is the largest city in area code 520. Other notable communities in the 520 region include Oro Valley, Marana, Sahuarita, Sierra Vista, and Casa Grande. The region includes desert basins, mountain ranges, and major transportation routes such as Interstate 10.

History of Area Code 520

Area code 520 was created on March 19, 1995, in a split from area code 602. The split happened because Arizona needed more phone numbers as population and phone use grew. Before 1995, area code 602 covered the entire state of Arizona.

Area code 520 later lost some territory when Arizona added new area codes. On June 23, 2001, area code 928 split off to serve northern and western Arizona, leaving 520 focused on southern Arizona. Area code 520 is a split area code, not an overlay.

Key Facts About Area Code 520

• Area code 520 is a geographic area code in the state of Arizona.
• Tucson is the largest city in area code 520, and Casas Adobes is one of the communities it serves in Pima County.
• Area code 520 was created on March 19, 1995, when it split from area code 602.
• Area code 928 split from area code 520 on June 23, 2001, reducing 520 to southern Arizona.
• Area code 520 is in the Mountain Time Zone, and most of Arizona does not observe daylight saving time.
• The University of Arizona in Tucson is one of the best-known institutions in area code 520.
• Area code 520 serves communities near major landmarks such as Saguaro National Park and the Sonoran Desert.
• Area code 520 includes cities and towns near the Mexican border, including Nogales and Douglas.

Frequently Asked Questions

What state is area code 520 in?

Area code 520 is in Arizona.

What major cities use area code 520?

Major cities and communities in area code 520 include Tucson, Casas Adobes, Oro Valley, Marana, Nogales, Sierra Vista, Douglas, Sahuarita, and Casa Grande.

Is area code 520 a toll-free number?

No. Area code 520 is a geographic area code for southern Arizona.