Area Code Overview

Area code 623 is a geographic telephone area code in Arizona that went into service on March 1, 1999. The geographic regions covered by this area code overlay has a population of approximately 2,040,306.

Overlay and Dialing Rules

Area Code: 623
State: Arizona
Type: General Purpose Code
In Service Date: March 1, 1999
Overlay Complex: 480/602/623
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 623

This area code is tied for 268th out of 363 nationwide in estimated assigned phone numbers. Within the state territory it serves, it is ranked 5th out of 5.

2,781,000

Estimated Service-Type Mix of Assigned Phone Numbers in Area Code 623

Total assigned 2,781,000

Wireless

1,056,000 assigned

37.97%

Wireline and VoIP

1,697,000 assigned

61.02%

Other / Unclassified

28,000 assigned

1.01%

Estimated Share of Wireless Numbers Originally Assigned to Each Carrier in Area Code 623

Estimated assigned wireless phone numbers: 1,056,000

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

T-Mobile 564,000 (53.41%)

Verizon Wireless 271,000 (25.66%)

AT&T Wireless 221,000 (20.93%)

Estimated Share of Wireline and VoIP Numbers Originally Assigned to Each Carrier in Area Code 623

Estimated assigned wireline and VoIP phone numbers: 1,697,000

Lumen 843,000 (49.68%)

Onvoy 357,000 (21.04%)

Comcast Business 205,000 (12.08%)

Bandwidth 119,000 (7.01%)

MCIMETRO ACCESS TRANSMISSION SERVICES LLC 69,000 (4.07%)

Spectrum 43,000 (2.53%)

Peerless Network 15,000 (0.88%)

Commio 12,000 (0.71%)

Telnyx 10,000 (0.59%)

ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7,000 (0.41%)

PAETEC ITEL, LLC 7,000 (0.41%)

RE-INVENT TELECOM, LLC - AZ 5,000 (0.29%)

Other / Unclassified Assigned Numbering in Area Code 623

Estimated assigned other or unclassified phone numbers: 28,000

TELEPORT COMMUNICATIONS AMERICA, LLC - AZ 18,000 (64.29%)

FRACTEL, LLC 6,000 (21.43%)

ALLO COMMUNICATIONS LLC 2,000 (7.14%)

ACCIPITER COMMUNICATIONS INC 1,000 (3.57%)

TON80 COMMUNICATIONS, LLC 1,000 (3.57%)

Cities and Towns in Area Code 623

Phoenix, Arizona

These geographic regions are also served by area codes 480 and 602.

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 623, 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