Where Is Area Code 520?
Area code 520 serves southern and southeastern Arizona, with Tucson as its main urban center. Casas Adobes, a census-designated place in Pima County, is a primary community associated with the area code. The region belongs to the Mountain West.
The 520 service area includes communities in Pima, Pinal, Santa Cruz, and Cochise counties. Major communities include Tucson, Casa Grande, Sierra Vista, Nogales, Douglas, Bisbee, Marana, Oro Valley, and Sahuarita. The area reaches the Mexico border near Nogales and the New Mexico border in eastern Cochise County.
Notable geographic features include the Santa Catalina Mountains and Mount Lemmon north of Tucson. Saguaro National Park lies on the east and west sides of Tucson, and Chiricahua National Monument is in Cochise County near Willcox.
Cities and Communities in the 520 Area Code
- Tucson, Pima County
- Casas Adobes, Pima County
- Marana, Pima County
- Oro Valley, Pima County
- Sahuarita, Pima County
- South Tucson, Pima County
- Green Valley, Pima County
- Casa Grande, Pinal County
- Coolidge, Pinal County
- Eloy, Pinal County
- Florence, Pinal County
- Maricopa, Pinal County
- Sierra Vista, Cochise County
- Benson, Cochise County
- Bisbee, Cochise County
- Douglas, Cochise County
- Tombstone, Cochise County
- Willcox, Cochise County
- Nogales, Santa Cruz County
- Patagonia, Santa Cruz County
History of Area Code 520
Area code 520 began service on March 1, 1995, after Arizona split area code 602. Area code 602 had served the entire state before the change. The new 520 code covered southern and eastern Arizona, including Tucson and nearby communities.
Arizona split area code 520 again on June 1, 2001, to create area code 928 for northern and western parts of the state. The 2001 change reduced the geographic size of area code 520 and left it focused on Tucson and southeastern Arizona. The change was a geographic split, not an overlay.
Key Facts About Area Code 520
- Area code 520 is a geographic telephone area code in Arizona, and Tucson is its major city.
- Casas Adobes is a census-designated place in Pima County and the primary locality associated with area code 520.
- Area code 520 is part of the Mountain West region of the United States.
- Area code 520 was established in 1995 by splitting area code 602.
- Area code 928 was created from a 520 split in 2001 for northern and western Arizona.
- Area code 520 uses Mountain Time year-round and does not observe daylight saving time.
- The University of Arizona’s main campus is in Tucson, within the 520 service area.
- Saguaro National Park is located on both sides of Tucson in the 520 region.
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 using area code 520 include Tucson, Casa Grande, Sierra Vista, Nogales, Douglas, Bisbee, Marana, and Oro Valley.
What time zone is area code 520 in?
Area code 520 uses Mountain Time and does not observe daylight saving time.
Is area code 520 a toll-free number?
No. Area code 520 is a geographic area code, not a toll-free number.