Area Code 425

Washington

Area code 425 serves Washington, primarily Bellevue, in the Pacific Time (PT) time zone. It was created from a split of area code 206.

Split Area Code

This area code was created by splitting an existing area code into separate geographic regions. When a split occurs, some customers in the original area code region are assigned the new area code.

This area code was split from area code 206 (Seattle).

In service since: 27-Apr-1997

Learn more about overlay and split area codes →

Demographics & Economics

Total Population: 1,445,352
Population Density: 624 people/sq mi
above U.S. average (U.S.: 93 people/sq mi)
Median Household Income: $122,148
above U.S. median (U.S.: $75,144)
Poverty Rate: 8.2%
below U.S. average (U.S.: 11.5%)
Unemployment Rate: 4.5%
above U.S. average (U.S.: 3.6%)
Education Attainment: Bachelor's Degree+
47.7%
above U.S. average (U.S.: 33.7%)
High School or Lower
20.9%

Statistics are population-weighted aggregations from Census ACS 5-year estimates. Population figures are approximate — see Sources & Methodology for details on how area code populations are derived.

See how this area code compares to all US area codes in the Statistics dashboard.

Time Zone

Pacific Time (PT)

NANPA Relief Status

According to the latest NANPA analysis (July 2026), this area code is not currently listed as exhausting within the next 36 months. No relief planning is in progress for this NPA.

Source: NANPA NPA Relief Planning Reports · See all relief planning statuses

Current Time

Pacific Time (PT)

Prefix Utilization

Geographic Coverage

State

Major Cities

Bellevue
Everett
Renton
Kirkland
Redmond
Marysville
Sammamish
Bothell
Edmonds
Lynnwood
Lake Stevens
Issaquah
Maple Valley
Mill Creek East
North Lynnwood
Kenmore
Eastmont
Union Hill-Novelty Hill
Cottage Lake
Martha Lake
Silver Firs
Mountlake Terrace
Mukilteo
Bothell West

and 49 more cities

Area Code 425 geographic coverage map (light mode)

Historical Timeline of Area Code 425

Area code 425 was established on April 27, 1997, when the Washington Utilities and Transportation Commission authorized a split of the 206 NPA to relieve numbering pressure in the Seattle metropolitan area. The split created three distinct codes: 206 for Seattle proper, 425 for the Eastside communities, and 253 for the Tacoma region. Source: Washington UTC

Following the split, industry stakeholders convened to address future numbering needs across Western Washington. By 2001, the Washington UTC reached consensus on a single overlay approach. Source: WUTC Docket UT-991535

Key milestones:

1997: Area code 425 created from area code 206 split, serving Bellevue, Redmond, Kirkland, and surrounding Eastside communities
2001: Washington UTC approved overlay plan for 206, 425, 253, and 360 NPAs with overlay code 564
2017: Overlay code 564 activated for the 360 NPA, while remaining reserved for future activation in 206, 253, and 425.

The overlay plan adopted a stepped approach, with 564 activated first for area code 360 as demand grew in Western Washington's outer regions. The reserve status of 564 for 425, 206, and 253 reflects the continued numbering capacity within these NPAs.

Regulatory History

Area code 425 has been subject to three significant regulatory actions since its creation, primarily through Washington state's UTC rather than direct FCC intervention. Source: Washington UTC

Year	Event	Docket	Regulatory Action & Impact
1997	NPA Split	NANPA PL-019	Split of 206 NPA into three codes: 206 (Seattle core), 425 (Eastside/Bellevue), and 253 (Tacoma/Kent). Effective April 27, 1997 to relieve numbering pressure in the Seattle metropolitan area.
2001	Overlay Approval	WUTC UT-991535	Washington UTC approved Overlay Option #3, establishing 564 as a single overlay code for 206, 425, 253, and 360 NPAs. Implementation deferred pending exhaustion of existing numbering resources.
2014	Stepped Overlay Plan	WUTC UT-143787	Revised overlay plan approved with stepped activation: 564 activated for 360 NPA first, with 206, 253, and 425 reserved for sequential activation as numbering resources approach exhaustion.