Where is the 520 area code?

Area code 520 covers Tucson in Arizona, on Mountain Standard Time (no daylight saving).

What time zone is area code 520 in?

Numbers in the 520 area code sit in Mountain Standard Time (no daylight saving).

Is 520 a toll-free or scam area code?

No. 520 is a geographic North American Numbering Plan area code assigned to Arizona. Toll-free numbers use 800, 833, 844, 855, 866, 877 and 888. A call from 520 can still be spoofed, so treat unexpected calls with the usual caution.

Area code lookup

520 area code

Where the 520 area code is, which cities and counties it serves, the local time zone and the overlay codes dialled alongside it.

State: AZ
Cities covered: 1
Counties: 1
Time zone: Mountain Standard Time

Quick answer

Area code 520 serves Tucson in Arizona. It sits in Mountain Standard Time (no daylight saving) and covers 1 county and about 10 ZIP codes across the metros we track.

Cities in the 520 area code

Each city links to its full local profile: sales tax, housing, income and ZIP codes.

City	County	Time zone	ZIP codes
Tucson, AZ	Pima County	MST/MST	10

520 area code FAQ

The questions people ask about this code.

Where is area code 520?

520 is a geographic area code in Arizona, covering Tucson.

What time is it in the 520 area code?

520 observes Mountain Standard Time (no daylight saving) (MST/MST).

Is 520 a scam area code?

No — it is a normal geographic code, not a toll-free or premium-rate prefix. Caller ID can be spoofed on any code, so verify unexpected callers before sharing information.

Sources & transparency

North American Numbering Plan Administrator (NANPA) area code assignments — area code to geography mapping and overlay relationships
US Census Bureau, American Community Survey 2019-2023 5-year estimates — city, county and ZIP code geography

Last reviewed August 2026. Figures are published for reference and can change; verify with the source agency before filing or contracting. How we build and check this data.