Area code 520
Area code 520 serves Tucson and nearby parts of Arizona, including Casa Grande, Sierra Vista and Nogales. It is on Mountain Standard Time all year, with no daylight saving time.
Area code 520 at a glance
| State | Arizona (AZ) |
| Main city | Tucson |
| Time zone | Mountain Standard Time |
| UTC offset | UTC−7 |
| Daylight saving time | No |
Cities in 520
- Tucson
- Casa Grande
- Sierra Vista
- Nogales
An area code shows where a number was first assigned. Mobile numbers keep their area code when people move, so the person you’re calling may be somewhere else.
When you can call a 520 number
Federal telemarketing rules under the TCPA allow sales calls between 8 AM and 9 PM in the called person’s local time. Here is that window for a 520 number, shown in your own time zone.
General information, not legal advice. Some states add rules for Sundays, holidays or the number of calls. See our calling hours guide.
| If you’re on | You can call 520 between |
|---|---|
| Eastern | 11:00 AM to 12:00 AM |
| Central | 10:00 AM to 11:00 PM |
| Mountain | 9:00 AM to 10:00 PM |
| Arizona | 8:00 AM to 9:00 PM |
| Pacific | 8:00 AM to 9:00 PM |
See the time in 520 without leaving your CRM
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Questions about 520
What time zone is area code 520?
Area code 520 is on Mountain Standard Time. It does not observe daylight saving time.
Where is area code 520?
Area code 520 is in Arizona. Its main city is Tucson, and it also covers Casa Grande, Sierra Vista and Nogales.
What are the legal hours to call a 520 number?
Under the federal TCPA, sales calls are allowed from 8 AM to 9 PM in the called person’s local time. Personal and informational calls are not limited by these hours.