North American Numbers Source-cited · ownership disclosed
Area code
564
In service
United States · since 2017

Western Washington (statewide overlay)

Area code 564 is Washington's overlay code, not tied to one region. It went live over the 360 NPA in 2017 and expanded to overlay the 206 (Seattle) NPA in 2025, with 253 and 425 planned to follow.

The essentials Numbering data · NumberResearch · as of 2026-09-18
Place
Western Washington (statewide overlay)
Type
geographic
Status
in service
In service since
2017
Projected exhaust
2073 Q2

Status, dates and counts are read from NumberResearch (NANPA / CNAC / FCC records). Assignment records show initial assignees, not the carrier serving a number today.

A · Where it is

Where 564 is

Same geography as the NPAs it overlays: currently 360 (western Washington outside the metro) and 206 (Seattle); intended to eventually overlay 253 and 425..

Communities served wholly or partly by 564:

SeattleOlympiaBellinghamVancouverBremerton

As an overlay, 564 shares the territory of whichever NPA it overlays. Cities listed are drawn from its current 206 and 360 coverage.

B · Relationships

How it relates to other codes

The codes 564 was split from, spawned, or shares its area with. A split divides the map and changes some numbers; an overlay shares the same ground and changes none — what's the difference?

Overlay · 2017 360 Western Washington (outside Seattle metro) First activated as an overlay of the 360 NPA on August 28, 2017.
Overlay · 2025 206 Seattle Overlay extended to the 206 (Seattle) NPA on June 10, 2025.
Overlay 253 Tacoma Planned to overlay 253 when exhaustion requires relief; not yet active. Re-check NANPA.
Overlay 425 Bellevue / Everett (Seattle north & east suburbs) Planned to overlay 425 when exhaustion requires relief; not yet active. Re-check NANPA.
What's changing. Active overlay of 360 (2017) and 206 (2025); intended to expand to 253 and 425. Re-check NANPA for newer expansions.
C · History

How 564 got here

2017-08-28
Area code 564 placed in service as an overlay of the 360 numbering plan area.
Source: Wikipedia
2025-06-10
564 overlay extended to the 206 numbering plan area.
Source: Wikipedia
D · Capacity

How full it is

Prefixes assigned
110
Prefixes available
690
Thousands-blocks assigned
784

Prefix-assignment counts describe allocation to carriers, not how many individual numbers are in use. Full technical records: NumberResearch ↗.

Compare 564 with another code →
Sources
Wikipedia ↗
Area codes 206 and 564
NumberResearch.org ↗
Live status, dates, assignment counts and exhaust forecast — data as of 2026-09-18 (CC BY 4.0).

Place, relationships and history above are compiled by North American Numbers from the sources listed and last checked 2026-09-18. A check date is not an expert review — see how this is made. Flag an error.