SherbyNet - /page/wikibook/entry.mu

Micron Document

<!DOCTYPE html>

Area code 564

</h1>

</header>

/* start https://en.wikipedia.org/ */

.mw-parser-output .geo-default,.mw-parser-output .geo-dms,.mw-parser-output .geo-dec{display:inline}.mw-parser-output .geo-nondefault,.mw-parser-output .geo-multi-punct,.mw-parser-output .geo-inline-hidden{display:none}.mw-parser-output .longitude,.mw-parser-output .latitude{white-space:nowrap}

/* end https://en.wikipedia.org/ */

</style><a class="external text" href="geo:47.609722222222224,-122.33305555555555">47°36′35″N 122°19′59″W / 47.60972°N 122.33306°W / 47.60972; -122.33306</a>

Area code 564 is a telephone <a href="Overlay_complex" title="Overlay complex">overlay</a> <a href="Area_code" class="mw-redirect" title="Area code">area code</a> in the <a href="North_American_Numbering_Plan" title="North American Numbering Plan">North American Numbering Plan</a> (NANP) for <a href="Western_Washington" title="Western Washington">Western Washington</a> state, including metropolitan <a href="Seattle" title="Seattle">Seattle</a>. It overlays the combined numbering plan areas of area codes <a href="Area_code_206" title="Area code 206">206</a> and <a href="Area_code_360" title="Area code 360">360</a>.

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, <a href="Area_code_253" title="Area code 253">253</a>, and <a href="Area_code_425" title="Area code 425">425</a> 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.<a href="#cite_note-WUTC2023-1">[1]</a> <a href="Ten-digit_dialing" title="Ten-digit dialing">Ten-digit dialing</a> has been mandatory in all of western Washington since July 29, 2017.

<div class="mw-heading mw-heading2"><h2 id="History">History</h2></div>

From 1947 to 1957, all of Washington state was assigned <a href="Area_code_206" title="Area code 206">area code 206</a> for routing long-distance telephone calls in <a href="Operator_Toll_Dialing" title="Operator Toll Dialing">Operator Toll Dialing</a>. In 1957, the numbering plan area was split, with <a href="Area_code_509" title="Area code 509">area code 509</a> implemented for the state east of the <a href="Cascade_Range" title="Cascade Range">Cascade Range</a>. This configuration remained in place until 1995, when resource pressure from the proliferation of cell phones, fax machines, and pagers required additional central office prefixes and telephone numbers. Most of the region outside the Seattle and Tacoma areas was split from 206 to form a new numbering plan area with area code 360.

By the late 1990s, projections indicated possible exhaustion once again, so that in 1999, area code 564 was assigned for installation as an overlay of NPA 360, with an in-service date of August 1, 2000.<a href="#cite_note-2">[2]</a>

In May 2000, the <a href="Washington_Utilities_and_Transportation_Commission" title="Washington Utilities and Transportation Commission">Washington Utilities and Transportation Commission</a> (WUTC) projected that the metropolitan Seattle area codes (<a href="Area_code_206" title="Area code 206">206</a>, <a href="Area_code_253" title="Area code 253">253</a>, and <a href="Area_code_425" title="Area code 425">425</a>) would also soon exhaust their number pools, and it expanded the 564 plan to include those areas in the overlay.<a href="#cite_note-3">[3]</a> By the summer, however, the relief action was determined not to be immediately necessary. On August 22, 2001, the WUTC announced that increased efficiency in the reuse of the existing number pool meant that the immediate need for the new area code had subsided. Part of that was also attributed to a downturn in the telecommunications sector. The overlay implementation was suspended until at least October 1, 2002.<a href="#cite_note-4">[4]</a>

Since the development of the initial plan for the area code, the WUTC and the <a href="North_American_Numbering_Plan" title="North American Numbering Plan">NANPA</a> have rejected the telephone companies' request for a new area code and instead directed them to actively share and efficiently use the number blocks that had already been assigned. That refers mainly to the practice of <a href="Number_pooling" class="mw-redirect" title="Number pooling">number pooling</a>, which allocates a single <a href="Telephone_exchange" title="Telephone exchange">telephone exchange</a> prefix in ten blocks of one thousand telephone numbers for more efficient allocation, rather than assigning a prefix's whole numbering space (10,000 numbers) to one carrier in a single <a href="Rate_center" title="Rate center">rate center</a>.

The WUTC took further steps to decrease the need for new number blocks in 360 and 509 and head off the need for new area codes, including aggressive reclamation of unused and underused number blocks and exchanges. The introduction of mandatory <a href="Local_number_portability" title="Local number portability">local</a> and <a href="Wireless_number_portability" class="mw-redirect" title="Wireless number portability">wireless number portability</a> (a prerequisite for number pooling) has also served to stem the demand for new numbers and thus new area codes.<a href="#cite_note-WUTC-issues-2016-5">[5]</a>

According to the WUTC's estimate as of March 2014, the earliest projection for any Western Washington area code to be exhausted was 2018 for area code 360. The other codes were not expected to exhaust before 2025.<a href="#cite_note-WUTC-issues-2016-5">[5]</a>

Area code 564 was finally implemented on August 28, 2017.<a href="#cite_note-pl492-6">[6]</a>

Ten-digit dialing had been mandatory since July 29, 2017, for all local calls in Western Washington.<a href="#cite_note-7">[7]</a>

Since September 30, 2017, telephone numbers with the area code 564 have been issued in the existing number plan area 360.<a href="#cite_note-8">[8]</a>

On June 15, 2023, the WUTC approved expanding the coverage of area code 564 to include numbering plan area 206.<a href="#cite_note-WUTC2023-1">[1]</a>

Per NANPA analysis and determination, the overlay complex may be extended only as needed when NPAs 206 (which occurred in 2025), 253, or 425 are nearing exhaustion.<a href="#cite_note-9">[9]</a> NPAs 253 and 425 are nowhere near exhaustion.<a href="#cite_note-WUTC-issues-2016-5">[5]</a>

<ul><li><a href="List_of_North_American_Numbering_Plan_area_codes" title="List of North American Numbering Plan area codes">List of North American Numbering Plan area codes</a></li>

<li><a href="List_of_Washington_(state)_area_codes" title="List of Washington (state) area codes">List of Washington (state) area codes</a></li></ul>

<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>

/* start https://en.wikipedia.org/ */

.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}

/* end https://en.wikipedia.org/ */

</style><div class="reflist">

/* start https://en.wikipedia.org/ */

.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("./mw/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("./mw/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("./mw/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("./mw/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}

/* end https://en.wikipedia.org/ */

</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.utc.wa.gov/news/2023/new-area-code-coming-seattle-area">"New area code coming to Seattle area"</a>. WUTC. June 15, 2023.</cite>

</li>

<li id="cite_note-2"><a href="#cite_ref-2">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.nanpa.com/sites/default/files/planning_letters/PL-196.pdf">"Planning Letter 196: NANP-Overlay of 360 Numbering Plan Area (NPA) with 564 NPA (Washington)"</a> (PDF). <a href="NANPA" class="mw-redirect" title="NANPA">NANPA</a>. October 29, 1999. Retrieved May 9, 2025.</cite>

</li>

<li id="cite_note-3"><a href="#cite_ref-3">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.nanpa.com/sites/default/files/planning_letters/PL-239.pdf">"Planning Letter 239: NPA 564 to Overlay NPAs 206, 253, 360, and 425 (Washington)"</a> (PDF). NANPA. July 27, 2000. Retrieved May 9, 2025.</cite>

</li>

<li id="cite_note-4"><a href="#cite_ref-4">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.nanpa.com/sites/default/files/planning_letters/PL-298.pdf">"Planning Letter 298: Suspension of 564 Overlay (Washington)"</a> (PDF). NANPA. August 29, 2001. Retrieved May 9, 2025.</cite>

</li>

<li id="cite_note-WUTC-issues-2016-5">^ <a href="#cite_ref-WUTC-issues-2016_5-0">a</a> <a href="#cite_ref-WUTC-issues-2016_5-1">b</a> <a href="#cite_ref-WUTC-issues-2016_5-2">c</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.utc.wa.gov/regulatedIndustries/utilities/telcom/Pages/areaCodes.aspx">"Washington State Area Codes and Numbering Issues"</a>. Washington Utilities and Transportation Commission. March 2016. Retrieved December 30, 2016.</cite>

</li>

<li id="cite_note-pl492-6"><a href="#cite_ref-pl492_6-0">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://nationalnanpa.com/pdf/PL-492.pdf">"Planning Letter PL-492: NPA 564 to Overlay NPA 360 (Washington)"</a> (PDF). NANPA. June 28, 2016. Retrieved May 20, 2023.</cite>

</li>

<li id="cite_note-7"><a href="#cite_ref-7">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.utc.wa.gov/_layouts/15/CasesPublicWebsite/GetDocument.ashx?docID=51&year=2014&docketNumber=143787">"In the Matter of the Implementation of the 564 Numbering Plan Area: Order Adopting Implementation Plan (PDF)"</a>. Washington Utilities and Transportation Commission. May 20, 2016. Retrieved January 30, 2017.</cite>

</li>

<li id="cite_note-8"><a href="#cite_ref-8">^</a> <cite id="CITEREFBrown2021" class="citation news cs1">Brown, Andrea (March 23, 2021). <a rel="nofollow" class="external text" href="https://www.heraldnet.com/news/meet-area-code-564-the-new-kid-in-town-is-gaining-ground/">"Meet area code 564: The new kid in town is gaining ground"</a>. The Everett Herald. Retrieved March 23, 2021.</cite>

</li>

<li id="cite_note-9"><a href="#cite_ref-9">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.nanpa.com/sites/default/files/planning_letters/PL-492.pdf">"Planning Letter 492: NPA 564 to Overlay NPA 360 (Washington)"</a> (PDF). NANPA. June 28, 2016. Retrieved May 9, 2025.</cite>

</li>

</ol></div></div>

<div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2></div>

<ul><li><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.nanpa.com/resources/area-code-maps">"Area Code Maps"</a>. NANPA.</cite></li></ul>

<caption><a href="Washington_(state)" title="Washington (state)">Washington</a> area codes: <a href="Area_code_206" title="Area code 206">206</a>, <a href="Area_code_253" title="Area code 253">253</a>, <a href="Area_code_360" title="Area code 360">360</a>, <a href="Area_code_425" title="Area code 425">425</a>, <a href="Area_code_509" title="Area code 509">509</a>,

</caption>

</td>

<td width="30%" style="text-align:center;">North: <a href="Area_codes_778%2C_236%2C_and_672" class="mw-redirect" title="Area codes 778, 236, and 672">236/672/778</a>, <a href="Area_code_250" title="Area code 250">250</a>, <a href="Area_code_604" title="Area code 604">604</a>

</td>

</td></tr>

<tr>

<td width="10%" style="text-align:center;">West: <a href="Pacific_Ocean" title="Pacific Ocean">Pacific Ocean</a>, <a href="Area_code_236" class="mw-redirect" title="Area code 236">236</a>/<a href="Area_code_250" title="Area code 250">250</a>/<a href="Area_code_672" class="mw-redirect" title="Area code 672">672</a>/<a href="Area_code_778" class="mw-redirect" title="Area code 778">778</a>

</td>

</td>

</td></tr>

<tr>

</td>

<td width="30%" style="text-align:center;">South: <a href="Area_codes_503_and_971" title="Area codes 503 and 971">503/971</a>

</td>

</td></tr>

<tr>

<td colspan="3" style="text-align:center;"><a href="British_Columbia" title="British Columbia">British Columbia</a> area codes: <a href="Area_code_250" title="Area code 250">250</a>, <a href="Area_code_604" title="Area code 604">604</a>, <a href="Area_code_236" class="mw-redirect" title="Area code 236">236</a>/<a href="Area_code_257" class="mw-redirect" title="Area code 257">257</a>/<a href="Area_code_672" class="mw-redirect" title="Area code 672">672</a>/<a href="Area_code_778" class="mw-redirect" title="Area code 778">778</a>

</td></tr>

<tr>

<td colspan="3" style="text-align:center;"><a href="Oregon" title="Oregon">Oregon</a> area codes: <a href="Area_codes_503_and_971" title="Area codes 503 and 971">503/971</a>, <a href="Area_codes_541_and_458" title="Area codes 541 and 458">541/458</a>

</td></tr>

</tbody></table></div><div><div class="zim-footer">

This article is issued from <a class="external text" title="Last edited on 2025-06-14" href="https://en.wikipedia.org/wiki/?title=Area_code_564&oldid=1295584125">Wikipedia</a>. The text is available under <a class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/deed.en">Creative Commons Attribution-Share Alike 4.0</a> unless otherwise noted. Additional terms may apply for the media files.

</div>

</div></div>

</div>

</main>

</div>

</body></html>