What Is the 520 Area Code? A Plain Guide to Southern Arizona
A 520 number tells anyone who sees it: this caller is rooted in Tucson and the desert country around it. That single detail can decide whether a local picks up or lets the call ring out.
Southern Arizona has used the 520 prefix for three decades, and it still carries real weight. This guide covers exactly where it reaches, what time it keeps, how to dial it, and how a business anywhere can pick up a 520 line.
We run virtual numbers for businesses through My Country Mobile (MCM), so we deal with area-code questions daily. Here's the accurate version, no fluff.
520 AREA CODE AT A GLANCE
If you only read one section, read this one. Everything below is verified for 2026.
| Detail | Information |
|---|---|
| Region | Southern Arizona |
| Largest city | Tucson |
| Counties | Pima, Cochise, Santa Cruz, Graham, Greenlee, parts of Pinal |
| Time zone | Mountain Standard Time (MST), no Daylight Saving |
| In service since | March 19, 1995 |
| Overlay code | None — 520 stands alone |
| Created from | A split of the 602 area code |
WHERE THE 520 AREA CODE ACTUALLY REACHES
The 520 prefix covers the lower third of Arizona — a stretch of desert, border towns, and one mid-size metro. It does not cover Yuma, which sits on 928.
Tucson is the anchor, home to the University of Arizona and the region's biggest employers. Beyond the city, 520 spreads across roughly six counties of ranch land and small towns.
Cities and Towns on 520
The prefix serves a wide mix of communities, each with its own economy.
- Tucson — the metro hub; university, healthcare, and aerospace jobs
- Sierra Vista — built around Fort Huachuca and military families
- Nogales — a border city with heavy cross-border trade
- Casa Grande — a fast-growing logistics and manufacturing town
- Green Valley — a well-known retirement community south of Tucson
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WHAT TIME IS IT IN THE 520 ZONE?
Arizona is the tricky one. The 520 region runs on Mountain Standard Time all year and does not observe Daylight Saving Time.
That means for half the year Arizona matches Pacific Time, and for the other half it matches Mountain Time. If you call a 520 number, double-check the season.
For businesses, this matters: a meeting that's 2 p.m. for a Tucson client could land an hour off if your calendar auto-adjusts. Confirm before you book.
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HOW TO DIAL A 520 NUMBER
Dialing rules in Arizona follow the standard U.S. pattern, with one habit worth keeping.
Calls within the same area still work as 10-digit dials (520 + the seven-digit number), and that's now the safe default everywhere. From outside the U.S., add the +1 country code first.
Quick Dialing Reference
- Local or in-state call: 520 + 7-digit number
- From elsewhere in the U.S.: 1 + 520 + 7-digit number
- International: +1 + 520 + 7-digit number
IS THE 520 AREA CODE RUNNING OUT OF NUMBERS?
Not anytime soon. Unlike crowded metro codes, 520 still has plenty of unassigned number blocks.
There is no overlay code layered on top of it and none publicly planned. Southern Arizona's population growth is steady, not explosive, so the supply holds.
That stability is good news if you want a 520 number — you can still get one with a clean, memorable sequence.
HOW TO LOOK UP A 520 NUMBER
Got a missed call from a 520 number you don't recognize? A reverse lookup takes under a minute.
Use a reputable reverse phone lookup service, enter the full 10-digit number, and run the search. Results often show the registered name, line type, and rough location.
If the number turns out to be spam, block it and report it. Legitimate local callers will usually leave a voicemail.
WHY A LOCAL 520 NUMBER HELPS A BUSINESS
A local number is quiet credibility. People across southern Arizona answer calls from a 520 prefix more readily than calls from an unfamiliar one.
You don't need a Tucson storefront to get one. A virtual 520 number gives a remote team, a startup, or an out-of-state company an instant local footprint.
What a Virtual 520 Line Actually Does
A cloud number isn't tied to a desk phone — it routes wherever you want.
- Forward calls to a mobile, a softphone, or a whole team
- Send voicemail straight to email as audio or text
- Add an auto-attendant so callers reach the right person fast
- Keep your existing number while you test a 520 line alongside it
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A COUPLE OF THINGS TO WATCH
A new local number isn't all upside. Two small headaches are worth planning around.
First, fresh number blocks sometimes attract more telemarketing at the start — register on the national Do Not Call list to cut that down. Second, if you're switching numbers, budget time to update your website, listings, and signage.
Neither is a dealbreaker. A cloud phone system makes the switch smoother by letting you forward the old line while the new one takes over.
THE BOTTOM LINE ON 520
The 520 prefix is southern Arizona's phone identity — Tucson, the border towns, and the desert counties around them, all on Mountain time with no clock changes.
If you want to reach that market, a local number is the cheapest trust signal you can buy. Decide who should answer it, then set up forwarding so no call slips through.
Ready to claim one? You can have a working 520 line today and route it anywhere you like.
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FAQs
Where is the 520 area code located?
It covers southern Arizona, anchored by Tucson, and spans counties including Pima, Cochise, Santa Cruz, Graham, and Greenlee. Yuma is not part of it — that city uses 928.
What cities use the 520 area code?
Tucson is the largest, followed by Sierra Vista, Nogales, Casa Grande, and Green Valley, plus many smaller desert and border communities.
What time zone is the 520 area code in?
Mountain Standard Time, year-round. Arizona does not observe Daylight Saving Time, so the 520 region keeps the same clock all twelve months.
Does the 520 area code have an overlay?
No. The 520 prefix stands on its own with no overlay code, so you still dial it as part of the standard 10-digit number.
When was the 520 area code created?
It went into service on March 19, 1995, formed from a split of the 602 area code to add numbers as Arizona grew.
Can I get a 520 number if I don't live in Arizona?
Yes. A virtual 520 number from a provider like MCM works from anywhere and rings on the device you already use.
Is a 520 number safe to answer?
Most are legitimate local calls. If you don't recognize one, run a reverse lookup before calling back, and block any number flagged as spam.
