Lesson plan
Area code 564
Area code 564 is a telephone overlay area code in the North American Numbering Plan (NANP) for Western Washington state, including metropolitan Seattle. It overlays the combined numbering plan areas of area codes 206 and 360. The area code was first proposed in 1999 to relieve telephone number shortages of area code 360, but implementation was delayed until 2017, when it was installed as an overlay to numbering plan area (NPA) 360. Neighboring NPAs 206, 253, and 425 were slated for expansion of the overlay complex upon exhaustion of central office codes in each NPA. In 2023, area code 206 was approved for expansion with a guide line for preparation of inclusion of at least nine months. Ten-digit dialing has been mandatory in all of western Washington since July 29, 2017.
Article summary
Area code 564 is a telephone overlay area code in the North American Numbering Plan (NANP) for Western Washington state, including metropolitan Seattle. It overlays the combined numbering plan areas of area codes 206 and 360. The area code was first proposed in 1999 to relieve telephone number shortages of area code 360, but implementation was delayed until 2017, when it was installed as an overlay to numbering plan area (NPA) 360. Neighboring NPAs 206, 253, and 425 were slated for expansion of the overlay complex upon exhaustion of central office codes in each NPA. In 2023, area code 206 was approved for expansion with a guide line for preparation of inclusion of at least nine months. Ten-digit dialing has been mandatory in all of western Washington since July 29, 2017.
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Discussion questions
- Summarise the article in your own words. Which single claim would you verify first, and why?
- Which claim in this article is most likely to be revised as the sources update? How would you check its current status?
- If two sources disagreed about one of these facts, what would you need in order to trust one over the other?
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