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US area codes

Washington area codes

A checked list of 6 in-service geographic area codes in Washington, with their dates, overlay partners and dialing rules.

Last checked 14 October 2026

Area codes across North America

Codes in service in Washington

Washington has 6 geographic area codes in service: 206, 253, 360, 425, 509, 564. 206 is the oldest, dated 1947, and 564 the newest, dated 28 Aug 2017.1 All of Washington's codes are on Pacific time.

Area codeNANPA locationNPA in-service dateIn-service overlay peersTime zoneLocal calls within the code
206WA1947564Pacific10 digits
253WA27 Apr 1997None listedPacific10 digits
360WA15 Jan 1995564Pacific10 digits
425WA27 Apr 1997None listedPacific10 digits
509WA1957None listedPacific10 digits
564WA28 Aug 2017206, 360Pacific10 digits

Scroll the table sideways to see every column. Sources: NANPA (14 October 2026 file).

History and overlays in Washington

  • Before 1960: 206 (1947), 509 (1957)
  • 1990s: 360 (15 Jan 1995), 253 (27 Apr 1997), 425 (27 Apr 1997)
  • 2010s: 564 (28 Aug 2017)

Washington's in-service overlay groups are 206/564; 360/564.1

  • 206/564: 206 (1947) was joined by 564 on 28 Aug 2017.
  • 360/564: 360 (1995) was joined by 564 on 28 Aug 2017.

Dialing in Washington

Local calls within a single area code in Washington (206, 253, 360, 425, 509, 564) are all recorded as 10 digits. From any of Washington's codes, local calls to another area code are all recorded as 10 digits.1

Pending codes in Washington

NANPA marks relief planning as in progress for 509.

Neighbours of Washington

Regions that border Washington:

Rules that apply to every region are on the area-code reference.

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Further reading

Longer research pieces on this topic, each with its own source list and a downloadable PDF.

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A 2026 U.S. guide to choosing a Google Business Profile primary number, evaluating tracking versus a stable main line, checking account ownership, and testing calls before and after an edit.

Articles on this topic

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Sources

Every regulatory and pricing claim on this page links to the primary source it came from. Figures were checked on the date shown at the top of the page; rules and prices change, so verify before relying on one.

  1. NANPA, NPA Database CSV, file dated 14 October 2026; US geographic codes, location, dates, overlay complexes, dialing plan and time zone. Retrieved 14 Oct 2026
    https://reports.nanpa.com/public/npa_report.csv

Keep reading

Reference
How overlays work
Why two codes can serve the same area and what ten-digit dialling changes.
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