🇺🇸 520 area code
Area code 520 covers Tucson, Sierra Vista, Casa Grande and Nogales and the surrounding area in Arizona. Enter a 520 number below for a free check before you call back.
- Location: Tucson, Arizona
- Time zone: Mountain (UTC−7)
- In service since March 19, 1995
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Area code 520 at a glance
- Area code
- 520
- Location
- Arizona, United States
- Main cities
- Tucson, Sierra Vista, Casa Grande, Nogales, Douglas, Green Valley
- Time zone
- Mountain (UTC−7)
- Local time now
- —
- In service since
- March 19, 1995
- Created from
- 602
- Codes split from it
- 928
- Local calls
- Dial 10 digits
- Number format
- (520) 555-0123
- From abroad
- +1 520 555 0123
Cities in area code 520
- Tucson
- Sierra Vista
- Casa Grande
- Nogales
- Douglas
- Green Valley
- Ajo
- Benson
- Bisbee
- Coolidge
Is a 520 call a scam?
An area code tells you where a number was first assigned, not where the caller is. Mobile numbers keep their area code when people move, and internet (VoIP) numbers can be picked in any area code — so a 520 number can be calling from anywhere.
Robocallers exploit that with "neighbor spoofing": showing a 520 number to people in Arizona because a local-looking call is more likely to be answered. If a 520 call claims to be your bank, the IRS or a delivery company, hang up and call the official number yourself.
About area code 520
520 entered service on March 19, 1995, when it was split from 602.
As the region grew, 928 was carved out of or added to 520.
Area codes
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Area code 520 questions
Sources: NANPA NPA database (11/04/2026) and Google libphonenumber. Area codes show where a number was assigned, not where its owner is today.
Where is area code 520?
Area code 520 is in Arizona, United States. It covers Tucson, Sierra Vista, Casa Grande, Nogales, Douglas and Green Valley.
What time zone is area code 520?
520 is in the Mountain (UTC−7) time zone, and does not observe daylight saving time.
When did area code 520 start?
520 entered service on March 19, 1995, created from 602.
How do I find out who called me from 520?
Enter the full number in the lookup at the top of this page. The free check confirms whether the number is valid and shows its carrier, line type and region; a full report adds owner and public-web records where they are available.
Why am I getting calls from area code 520?
If you live in or near Arizona, they may be genuinely local — or robocalls spoofing a local-looking number. Unknown 520 callers who will not leave a message are best looked up before you call back.