Home

520 Area Code

Area Code Overview

Area code 520 is a geographic telephone area code in Arizona that went into service on March 19, 1995. The geographic regions covered by this area code overlay has a population of approximately 1,988,447.

Overlay and Dialing Rules

  • Area Code: 520
  • State: Arizona
  • Type: General Purpose Code
  • In Service Date: March 19, 1995
  • Overlay Complex: 520
  • Local Dialing Plan: This area does require you to dial the area code when calling locally.

Estimated Number of Assigned Phone Numbers in Area Code 520

This area code is ranked 118th out of 363 nationwide in estimated assigned phone numbers. Within the state territory it serves, it is ranked 3rd out of 5.

5,998,000

Estimated Service-Type Mix of Assigned Phone Numbers in Area Code 520

Total assigned 5,998,000
Wireless
2,341,000 assigned
39.03%
Wireline and VoIP
3,337,000 assigned
55.64%
Other / Unclassified
320,000 assigned
5.34%

Estimated Share of Wireless Numbers Originally Assigned to Each Carrier in Area Code 520

Estimated assigned wireless phone numbers: 2,341,000

Numbers may later be ported to another carrier, but this chart reflects original number assignment, not current subscriber share.

Verizon Wireless 874,000 (37.33%)
T-Mobile 859,000 (36.69%)
AT&T Wireless 606,000 (25.89%)
COMMNET WIRELESS, LLC 1,000 (0.04%)
Optimum Mobile 1,000 (0.04%)

Estimated Share of Wireline and VoIP Numbers Originally Assigned to Each Carrier in Area Code 520

Estimated assigned wireline and VoIP phone numbers: 3,337,000

Lumen 1,610,000 (48.25%)
Onvoy 629,000 (18.85%)
Bandwidth 265,000 (7.94%)
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ 255,000 (7.64%)
Comcast Business 141,000 (4.23%)
Peerless Network 104,000 (3.12%)
Spectrum 80,000 (2.40%)
GILA RIVER TELECOMM, INC. 70,000 (2.10%)
Telnyx 39,000 (1.17%)
Commio 35,000 (1.05%)
TERRA NOVA TELECOM INC. 21,000 (0.63%)
MIDVALE TELEPHONE EXCHANGE, INC. 20,000 (0.60%)

Other / Unclassified Assigned Numbering in Area Code 520

Estimated assigned other or unclassified phone numbers: 320,000

TELEPORT COMMUNICATIONS AMERICA, LLC - AZ 124,000 (38.75%)
VALLEY TEL COOP INC 60,000 (18.75%)
HD CARRIER LLC 22,000 (6.88%)
NORTH COUNTY COMMUNICATIONS CORPORATION 20,000 (6.25%)
TOHONO O'ODHAM UTILITY AUTHORITY 20,000 (6.25%)
VALLEY CONNECTIONS, L.L.C. - AZ 13,000 (4.06%)
TON80 COMMUNICATIONS, LLC 12,000 (3.75%)
IP HORIZON LLC 11,000 (3.44%)
FRACTEL, LLC 10,000 (3.13%)
SPOK, INC. 10,000 (3.13%)
INTRADO COMMUNICATIONS, LLC 8,000 (2.50%)
MCC TELEPHONY LLC 3,000 (0.94%)

Cities and Towns in Area Code 520

Ajo, Arizona Benson, Arizona Bisbee, Arizona Blackwater, Arizona Bowie, Arizona Casa Blanca, Arizona Casa Grande, Arizona Cascabel, Arizona Douglas, Arizona Elfrida, Arizona Flagstaff, Arizona Hayden, Arizona Komatke, Arizona Lone Butte Ranch, Arizona Maricopa Village, Arizona Nogales, Arizona Pearce, Arizona Portal, Arizona Prescott, Arizona Sacaton, Arizona San Manuel, Arizona San Simon, Arizona Santa Rosa, Arizona Sasabe, Arizona Sedona, Arizona Sells, Arizona Sierra Vista, Arizona Silver Bell, Arizona Stotonic, Arizona Sunizona, Arizona Superior, Arizona Tombstone, Arizona Tucson, Arizona Willcox, Arizona Yuma, Arizona

How These Figures Were Built

These figures are estimates based on public phone-number assignment records. They are meant to show the likely mix of assigned phone numbers associated with area code 520, not live customer counts.

Some providers may have assigned phone numbers tied to this area code even if they do not actively market or sell service locally. These figures reflect public number-assignment records, not confirmed local service availability.

They also do not reflect number portability at the individual phone-number level, so some numbers may now be used on a different network or by a different provider than the original assignment records suggest.

Population data and locality matching provided by GeoNames.

Last refreshed: April 15, 2026 6:22 pm