Seattle is served by 5 active area codes as of 2026, layered through decades of overlays and splits across the metro area. This guide walks through which code covers which part of the region, why so many codes are needed, and what new codes may come next.
The Short Answer
Seattle currently has 5 active area codes in service. The count reflects a combination of population growth, the rise of mobile lines, and the way modern numbering allocates blocks — every line activated, whether a cellphone, a business desk line, a VoIP number, or a connected device, consumes a slot in the pool.
Seattle has roughly 4,145,494 residents as of the most recent estimates. That population, combined with the spread of mobile and VoIP lines per household, determines how often new area codes are needed.
The Full List of Seattle Area Codes
The active area codes serving Seattle are listed below, in numerical order. Where a code is an overlay or a split-off from an earlier code, that relationship is noted.
- 206 — Seattle and its innermost suburbs (Shoreline, Mercer Island, Burien, SeaTac, Bainbridge Island)
- 253 — South Puget Sound (Tacoma, most of Pierce County, Federal Way, Kent, Auburn) (split from 206)
- 360 — Greater western Washington surrounding the metro core (Olympia, Bremerton, Bellingham, the Olympic Peninsula) (split from 206)
- 425 — Eastside and northern suburbs (Bellevue, Redmond, Kirkland, Everett, Bothell, Renton) (split from 206)
- 564 — Western Washington overlay, including the Seattle area (overlay of 206 and 360)
How Seattle’s Area Codes Grew Over Time
Seattle received its first area code, 206, when the North American Numbering Plan launched in 1947. That single code initially covered the entire state, and subsequent splits and overlays narrowed it over the decades that followed.
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Browse Seattle Area Codes →- 1947 — 206 assigned as Washington's sole area code at the launch of the North American Numbering Plan, covering the entire state including Seattle.
- 1957 — 509 split off from 206 for eastern Washington (east of the Cascade Range), leaving 206 to cover the western half of the state.
- 1995 — 360 split off from 206 on January 15, 1995, taking most of western Washington outside the Seattle and Tacoma areas; several Seattle exurbs were returned to 206 after resident protests.
- 1997 — On April 27, 1997, 206 was split three ways: 253 took the South Sound (Tacoma and Pierce County) and 425 took the Eastside and northern suburbs, leaving 206 for Seattle and its closest cities.
- 2017 — 564 went into service on August 28, 2017, as western Washington's first overlay code, initially covering the 360 numbering plan area, with numbers issued from September 30, 2017.
- 2023 — The Washington Utilities and Transportation Commission approved expanding the 564 overlay to cover the 206 numbering plan area on June 15, 2023.
- 2025 — The 206/564 overlay went into service on June 10, 2025, adding 564 as a second code for Seattle and its innermost suburbs as 206 neared exhaustion.
Why Seattle Has Multiple Area Codes
A single area code can hold roughly 7.9 million possible phone numbers in theory — 792 valid central office codes (the second three digits) multiplied by 10,000 line numbers each. In practice the usable count is lower, because blocks of numbers are reserved, withheld, or assigned in bulk to carriers that may never fully use them. When the pool of available numbers in an area code falls below the threshold the North American Numbering Plan Administrator (NANPA) tracks, the state requests relief, and either a split or an overlay is approved.
Seattle’s population of roughly 4,145,494 residents would, on its own, fit comfortably inside a single area code’s capacity. The reason 5 codes are needed instead is that every adult typically carries at least one mobile line, many households have multiple lines per person, businesses concentrate phone numbers at extreme density, and connected devices, VoIP services, and second-line apps all draw from the same pool. The math compounds quickly.
Seattle Area Codes by District
Seattle core (206, 564): Seattle proper and its closest suburbs, including Shoreline, Mercer Island, Burien, SeaTac, and Bainbridge Island. 206 is the original 1947 code; the 206/564 overlay went into service on June 10, 2025, so new lines in this territory may be assigned either code.
Eastside and northern suburbs (425): Bellevue, Redmond, Kirkland, Bothell, Lynnwood, Everett, and Renton, covering the Eastside and southern Snohomish County. Split from 206 on April 27, 1997.
South Sound (253): Tacoma, Federal Way, Kent, Auburn, Lakewood, and Puyallup, covering most of Pierce County and southern King County. Split from 206 on the same day as 425 in 1997.
Greater western Washington (360): The broader region ringing the metro, including Olympia, Bremerton, Bellingham, the Olympic Peninsula, and the San Juan Islands. 360 split from 206 in 1995, and the 564 overlay has shared this territory since 2017.
What’s Next for Seattle Area Codes
The most recent relief action in the Seattle area was the expansion of the 564 overlay to cover area code 206, which went into service on June 10, 2025, after NANPA projections showed 206 approaching exhaustion. Area code 564 had overlaid the 360 numbering plan area since 2017 and now serves both 206 and 360, supplying the metro’s near-term numbering relief. NANPA’s planning provides for extending 564 over 253 and 425 only as each nears exhaustion, and both still have ample numbering capacity, so no additional Seattle-area relief is projected in the immediate future.
Frequently Asked Questions
How many area codes does Seattle have right now?
Seattle has 5 active area codes in service across the territory it covers, including any overlays that share geography with an older code.
What is the oldest area code in Seattle?
206 is the oldest active area code in Seattle, assigned in 1947 when the North American Numbering Plan launched. It remains in service today, though its geographic footprint has typically been reduced by subsequent splits and overlays.
What is the newest area code in Seattle?
The most recent area code addition to Seattle was 206, activated in 2025. New phone lines provisioned in its service area are increasingly drawn from this code as older overlays approach exhaustion.
Why does Seattle need so many area codes?
Population growth combined with the proliferation of mobile lines, business direct-dial numbers, VoIP services, and connected devices has exhausted older codes faster than the original 1947 plan anticipated. Each new area code adds roughly 7.9 million additional phone numbers to the regional pool.
Which area code covers Seattle proper?
The city of Seattle and its closest suburbs use 206, the original code dating to 1947. Since June 10, 2025, new lines in the same territory can also be assigned 564 as an overlay, so a number with either code points to the Seattle core.
What is the difference between 206, 425, and 253?
All three were a single area code until April 27, 1997. Today 206 covers Seattle and its innermost suburbs, 425 covers the Eastside and northern suburbs such as Bellevue, Redmond, and Everett, and 253 covers the South Sound, including Tacoma and most of Pierce County.
Is 564 a real area code?
Yes. 564 is the overlay code for western Washington. It began serving the 360 region in 2017 and was extended to the 206 numbering plan area on June 10, 2025, so new Seattle-area phone numbers may be issued in 564.
Do I have to dial the area code for local calls in Seattle?
Yes. Ten-digit dialing has been mandatory throughout western Washington since July 29, 2017, because of the overlay codes. You must dial the full 10-digit number, area code plus the seven-digit number, even for local calls.
Is 360 a Seattle area code?
360 serves the wider region around the metro rather than the urban core, including Olympia, Bremerton, Bellingham, and the Olympic Peninsula. It split from 206 in 1995 and shares its territory with the 564 overlay.
Ready to Get a Number in Seattle?
We carry available Seattle numbers right now across multiple area codes. Order directly in 206, 253, 360, 425, or 564 — a one-time fee, no monthly charges, with pricing From $150 depending on the digit pattern and memorability of the number. Prefer help choosing? Call us at (212) 580-2000.
Related Reading
- Washington Area Codes: All 6 Active Codes by Region (2026)
- What Is Area Code 206? (Seattle, Washington)
- Where Is Area Code 425 Located?
- The 253 Area Code Explained — Washington Phone Numbers
- How Many Area Codes Are in the US
- How Do Area Codes Work
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