Tucson, AZ Area Code

Area code serving Tucson

Tucson sits in Arizona, part of the West region and the Mountain Time zone. Its area code is 520, which covers southern Arizona including Tucson, Casa Grande, Sierra Vista and Nogales. 520 has no overlay today, so every Tucson landline and mobile number with a local code starts with 520.

520 has served the area since 1995. If the region runs low on numbers, regulators will most likely add an overlay code on top rather than split the area, which would make 10-digit dialing mandatory.

Code	Area served	In service
520	Southern Arizona including Tucson, Casa Grande, Sierra Vista and Nogales	March 19, 1995

Nearby cities sharing this area code

• Casa Grande
• Marana
• Oro Valley
• Sierra Vista
• Maricopa
• Sahuarita
• Douglas
• Nogales
• Eloy
• Coolidge
• Benson

Getting a Tucson phone number

Any new landline, mobile or VoIP number from a local carrier in Tucson gets the 520 area code. Numbers come from the blocks each carrier holds in the area; a number ported in from elsewhere keeps its original area code, so you may also see out-of-state codes locally.

Dialing in Tucson

Tucson is covered by the single area code 520 with no overlay, so some local calls may still connect with seven digits. Dialing all 10 digits (area code + seven-digit number) always works and is the safest habit. From outside the US, dial +1, then the area code and number. See 10-digit dialing and overlay area codes for the background. For every code in Arizona, visit the Arizona area codes page.