Area Code Overview

Area code 425 is a geographic telephone area code in Washington that went into service on April 27, 1997. The geographic regions covered by this area code overlay has a population of approximately 1,610,382.

Overlay and Dialing Rules

Area Code: 425
State: Washington
Type: General Purpose Code
In Service Date: April 27, 1997
Overlay Complex: 425
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 425

This area code is ranked 171st out of 363 nationwide in estimated assigned phone numbers. Within the state territory it serves, it is ranked 4th out of 6.

5,249,000

Estimated Service-Type Mix of Assigned Phone Numbers in Area Code 425

Total assigned 5,249,000

Wireless

2,000,000 assigned

38.10%

Wireline and VoIP

3,099,000 assigned

59.04%

Other / Unclassified

150,000 assigned

2.86%

Estimated Share of Wireless Numbers Originally Assigned to Each Carrier in Area Code 425

Estimated assigned wireless phone numbers: 2,000,000

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

T-Mobile 948,000 (47.40%)

Verizon Wireless 580,000 (29.00%)

AT&T Wireless 472,000 (23.60%)

Estimated Share of Wireline and VoIP Numbers Originally Assigned to Each Carrier in Area Code 425

Estimated assigned wireline and VoIP phone numbers: 3,099,000

ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 996,000 (32.14%)

Lumen 843,000 (27.20%)

Onvoy 563,000 (18.17%)

Comcast Business 165,000 (5.32%)

Bandwidth 136,000 (4.39%)

ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 100,000 (3.23%)

MCIMETRO ACCESS TRANSMISSION SERVICES LLC 86,000 (2.78%)

Peerless Network 71,000 (2.29%)

Spectrum 38,000 (1.23%)

Commio 21,000 (0.68%)

Telnyx 18,000 (0.58%)

PAETEC ITEL, LLC 11,000 (0.36%)

Other / Unclassified Assigned Numbering in Area Code 425

Estimated assigned other or unclassified phone numbers: 150,000

TELEPORT COMMUNICATIONS AMERICA, LLC - WA 83,000 (55.33%)

ELTOPIA COMMUNICATIONS, LLC - WA 14,000 (9.33%)

HD CARRIER LLC 14,000 (9.33%)

FRACTEL, LLC 12,000 (8.00%)

SPOK, INC. 10,000 (6.67%)

TON80 COMMUNICATIONS, LLC 10,000 (6.67%)

IP HORIZON LLC 4,000 (2.67%)

ACCELERATE NETWORKS LLC 1,000 (0.67%)

FIVE9, INC. 1,000 (0.67%)

STRATUS NETWORKS 1,000 (0.67%)

Cities and Towns in Area Code 425

Ames Lake, Washington Bellevue, Washington Bothell, Washington Carnation, Washington Everett, Washington Fall City, Washington Hall, Washington Issaquah, Washington Kirkland, Washington Maple Valley, Washington North Bend, Washington Renton, Washington Silverlake, Washington Snoqualmie Pass, Washington

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 425, 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