520 area code
Tucson area, Arizona Time.Area code 520 covers Tucson, Sierra Vista, Casa Grande and 30 more places in Arizona, on Arizona Time.
Right now in Tucson
Arizona Time (MST, UTC-7, all year)
Calling hours: Every day, 8 AM to 9 PM (the federal rule)
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Where 520 numbers come from
Numbers are issued by rate center, a billing area named for its main town. 520 has 33. Each one's share is how many 520 numbers start there. Its biggest metro area is Phoenix-Mesa-Chandler, AZ.
- Tucson58%
- Sierra Vista10%
- Casa Grande10%
- Nogales4%
- Willcox3%
Also: Benson, Bisbee, Douglas, Hayden, San Manuel, Superior, Tombstone, Whitlow, Sacaton, Sasabe, Sells, Ajo + 16 more
Share of exchanges (blocks of 10,000 numbers). Source: NANPA rate center and exchange reports, November 10, 2026
When can you call a 520 number?
Sales calls to homes and cell phones have legal hours, set by the federal rule. Hold every 520 number to them, since you can't tell a work line from a personal cell.
What applies to 520Every day, 8 AM to 9 PM
- Federal (TCPA and FTC rule)Every day, 8 AM to 9 PMCalls to residential and mobile numbers. Most calls to businesses are exempt from the FTC's rule.47 CFR 64.1200(c)(1); 16 CFR 310.4(c) (opens in a new tab)
Local time comes from the area code, not from where the person is today. Mobiles keep their number when they move. Calling hours here are a guide, not legal advice. Every state's calling hours, with sources
The 520 area code
520 went into service on March 19, 1995, split off from 602, and 928 was later split off from it. Local calls take all 10 digits.
- 1995520 starts
- 2001928 split off
Source: NANPA area code database
Other Arizona area codes
All Arizona area codesCalling a list of 520 numbers?
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520 area code FAQ
What area code is 520?
520 is an Arizona area code for Tucson, Sierra Vista, Casa Grande, Nogales and 29 more places.
What time zone is the 520 area code in?
Arizona Time (MST, UTC-7, all year).
What are the calling hours for 520 numbers?
Every day, 8 AM to 9 PM, local time, under the federal rule.
When did the 520 area code start?
On March 19, 1995. It was split from 602.
Calling 520 numbers? Reach more of them.
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