520 Area Code: Tucson, Arizona
Area code 520 serves Tucson, Sierra Vista and Casa Grande, Arizona in the Mountain time zone, in service since 1995. Consumers have filed 8,102 unwanted-call complaints against 6,743 different 520 numbers, 1,234 of them with the FTC in the last 30 days. Look up the exact number that called you below.
Area code 520 at a glance
- State
- Arizona
- Main cities
- Tucson, Sierra Vista, Casa Grande, Nogales, Willcox + 31 more
- Counties
- Pima County, Cochise County, Pinal County, Santa Cruz County + 4 more
- Local time
- —Mountain (no daylight saving)
- In service since
- March 19, 1995
- Split from
- 602
- Codes split off
- 928 (2001)
- Local dialing
- 10 digits (area code + number)
- Exchanges
- 37 rate centers, 695 prefixes
Sources: NANPA area code and central office code records (refreshed weekly); cities and counties matched from US Census Bureau and USGS place names.
Most-reported 520 numbers
Ranked by FTC Do Not Call complaints this month, then all-time FTC and FCC complaints. Only numbers with enough complaints for a full report page are listed. Click one for what it was reported for and where.
- (520) 277-2479Debt reduction34 this month2026-10-09
- (520) 334-9571Impostor (government, business, family)22 this month2026-10-14
- (520) 655-9819Debt reduction10 this month2026-10-14
- (520) 812-5488Impostor (government, business, family)10 this month2026-10-09
- (520) 217-53747 this month2026-10-08
- (520) 305-0395Debt reduction5 this month2026-10-09
- (520) 815-45730 reports
What calls from 520 numbers are about
4,129 FTC Do Not Call complaints about 520 numbers since Jul 24. The most common named subject is debt-relief pitches, at 28% of complaints (92% of those were recorded messages). Overall, 77% of callers who answered said the call was a robocall.
FTC complaint subjects
- Other / unspecified1,75843%
- Debt reduction1,14628%
- Impostor (government, business, family)3789%
- No subject given2526%
- Dropped call / no message2055%
- Medical & prescriptions1935%
- Home improvement & cleaning471%
FCC complaints by call type, last 2 years
- Prerecorded Voice20243%
- Live Voice17537%
- Text Message9620%
20% of recent FCC complaints about 520 numbers are about text messages, not calls.
When 520 spam calls come in
29% of complaints that give a call time describe calls between 11am and 2pm. 94% came Monday to Friday, most on Tuesdays, the pattern of call-center robocall campaigns that run on business hours. Times are as consumers reported them to the FTC.
By hour of the day
By day of the week
Is it getting worse?
1,220 FTC complaints about 520 numbers in the last four weeks, down 11% on the four weeks before. FCC complaints about 520 numbers peaked in 2017 (579); the FTC's daily Do Not Call data has carried most of the volume since mid-2026.
FTC complaints per week
FCC complaints per year
Years shown as '15 to '26; the current year is partial.
Who gets these calls
Only 43% of the FTC complaints about 520 numbers came from Arizona residents; the most came from California, Florida and Illinois. 520 numbers are being used for nationwide campaigns, so the area code says little about where the caller is.
Where complainants live
- Arizona1,76743%
- California3298%
- Florida2586%
- Illinois2175%
- Georgia1433%
What people with 520 numbers report
People whose own number starts with 520 filed 3,021 FTC complaints since Jul 24. 47% were about calls showing another 520 number. The most common named subject was debt-relief pitches.
Area codes on the calls they reported
- 520 (same code)1,41047%
- 833 (toll-free)1385%
- 877 (toll-free)1104%
- 888 (toll-free)883%
- 855 (toll-free)823%
Likely campaigns using 520 numbers
Groups of numbers that drew the same FTC complaint in the same pattern over the last 60 days. The grouping is statistical and doesn't identify who is calling.
Busiest 520 prefixes this month
FTC complaints in the last 30 days, grouped by the first six digits. When one prefix collects complaints about many different numbers, a campaign is usually cycling through that block. The carrier is who NANPA assigned the prefix to, not who made the calls.
| Prefix | Complaints | Numbers | Carrier | Exchange |
|---|---|---|---|---|
| (520) 590-xxxx | 48 | 47 | Verizon Wireless (Cellco Partnership) | Bisbee |
| (520) 657-xxxxcampaign | 42 | 40 | Bandwidth.com | Hayden |
| (520) 277-xxxx | 38 | 5 | Onvoy (Sinch) | Whitlow |
| (520) 334-xxxx | 36 | 14 | Verizon Wireless (Cellco Partnership) | Tucson |
| (520) 521-xxxx | 24 | 14 | Hd Carrier LLC | San Manuel |
Carriers operating in 520
NANPA has assigned 695 520 prefixes (NPA-NXX central-office codes) across 37 rate centers: 37% to wireless carriers, 61% to landline and VoIP operators; 70% are pooled blocks shared by several carriers. 5 prefixes were assigned in the last 12 months (newest 2026-10-16). The carrier holding a prefix is who the number was issued through. It says nothing about who is calling, since caller ID is routinely spoofed.
| Carrier | Type | Prefixes | Rate centers | Newest assignment |
|---|---|---|---|---|
| Qwest (CenturyLink / Lumen) | Incumbent landline (ILEC) | 200(29%) | 13 | 2022-03-01 |
| Verizon Wireless (Cellco Partnership) | Wireless | 104(15%) | 12 | 2025-06-06 |
| T-Mobile USA | Wireless | 84(12%) | 10 | 2026-01-09 |
| AT&T Mobility (New Cingular Wireless PCS) | Wireless | 53(8%) | 7 | 2026-04-03 |
| Onvoy (Sinch) | Competitive / VoIP (CLEC) | 47(7%) | 14 | 2023-08-11 |
| MCImetro (Verizon Business) | Competitive / VoIP (CLEC) | 24(3%) | 2 | 2024-01-08 |
| Bandwidth.com | Competitive / VoIP (CLEC) | 17(2%) | 5 | 2022-12-15 |
| Level 3 (Lumen) | Competitive / VoIP (CLEC) | 17(2%) | 5 | 2023-06-26 |
| Teleport Communications America, LLC | Competitive / VoIP (CLEC) | 14(2%) | 3 | 2024-10-22 |
| Level 3 (Lumen) | Competitive / VoIP (CLEC) | 12(2%) | 3 | 2005-10-11 |
| Metro by T-Mobile (MetroPCS) | Wireless | 11(2%) | 4 | 2021-10-11 |
| Electric Lightwave LLC dba Allstream | Competitive / VoIP (CLEC) | 10(1%) | 7 | 2009-07-20 |
Largest rate centers (exchanges) by prefixes: Tucson (400), Sierra Vista (70), Casa Grande (67), Nogales (31), Willcox (18), Benson (12), Bisbee (9), Douglas (9), Hayden (9), San Manuel (8). Source: NANPA Central Office Code Utilized Assignments (public, refreshed weekly).
What to do about calls from 520 numbers
Before you call back
- Debt reduction is the top named complaint here. Don't pay upfront fees for debt relief; the FTC's Telemarketing Sales Rule bans them. Talk to your lender or a nonprofit credit counselor instead. Read about debt-relief robocalls.
- Look up the full number above. A missed call from 520 with no voicemail is usually a robocall; anyone who needs you will leave a message.
- Block repeat callers: iPhone, Android, or your carrier's free filter (Verizon, AT&T, T-Mobile).
Report it in Arizona
- Unwanted sales calls and robocalls: donotcall.gov (FTC). Scams and fraud: ReportFraud.ftc.gov.
- Spoofing, texts and call-blocking problems: FCC consumer complaints.
- State complaints: Arizona Attorney General.
- Arizona formally adopted the FTC's National Do Not Call Registry as its own state list rather than running a separate one, so a single free registration at donotcall.gov covers you. State authorities can still enforce against telemarketers who ignore it, in addition to any federal penalty.
Your FTC and FCC reports are published (without your name or number) in the datasets this page is built from. How to report unwanted calls.
Area code 520: questions answered from the data
Where is area code 520?
Area code 520 serves Tucson, Sierra Vista and Casa Grande, Arizona, covering Pima County, Cochise County and Pinal County and 5 more counties. It has been in service since March 19, 1995. It was split from area code 602.
What time zone is area code 520 in?
Area code 520 is in the Mountain time zone (UTC−7 all year, since Arizona does not observe daylight saving time). The current local time is shown at the top of this page.
What are calls from 520 numbers usually about?
Since Jul 24, consumers filed 4,129 FTC Do Not Call complaints about 520 numbers. The most common named subject was debt-relief pitches: 28% of complaints, 92% of them recorded messages. Across all subjects, 77% of callers who answered the question said the call was a robocall.
When do 520 spam calls happen?
29% of the complaints that give a call time describe calls between 11am and 2pm, and 94% came on weekdays, most often on Tuesday. Times are as consumers reported them.
Are calls from 520 numbers really local?
Not necessarily. Only 43% of the FTC complaints about 520 numbers came from Arizona residents; the most came from California, Florida and Illinois. 520 numbers are being used for nationwide campaigns, so the area code says little about where the caller is.
Are 520 robocalls increasing?
In the four weeks to Oct 20, consumers filed 1,220 FTC complaints about 520 numbers, 11% fewer than the four weeks before.
How do I report a 520 scam call in Arizona?
Report unwanted sales calls and robocalls to the FTC at donotcall.gov, and scams to ReportFraud.ftc.gov. The FCC takes complaints at consumercomplaints.fcc.gov. In Arizona, the Arizona Attorney General also handles consumer complaints about scam calls. Reports feed the public data this page is built from.
Other Arizona area codes
Sources: FTC Do Not Call complaints (unverified consumer reports), published every weekday and available here from Jul 24; FCC Consumer Complaint Data, public record, imported nightly; NANPA numbering records. A number appearing here means consumers reported calls that displayed it. Caller ID can be spoofed.