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The eastern part of
Washington is not as densely populated as the west side of the Cascades. As a result, 509 remained unchanged while the west side of the Cascades went from one area code to four from 1995 to 1997.
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However, the NANP Administrator has projected that 509's central office codes will exhaust by 2026. This is primarily due to the proliferation of cell phones, particularly in
Spokane, Yakima, and the Tri-Cities.
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by subscribers, AT&T divided the numbering plan area and designated the eastern part with area code 509 in 1956.
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With the build-out of the toll dialing system, and the beginnings of conversion for
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201:. American Telephone and Telegraph Company. September 1956. p. Sec II-App A-1.
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Prior to
October 2021, area code 509 had telephone numbers assigned for the
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50:. The numbering plan area (NPA) roughly comprises the state east of the
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Map of
Washington's area codes. The 509 area code is highlighted in red.
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as assigned as one of the 86 original North
American area codes.
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243:. North American Numbering Plan Administrator. January 8, 2021
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in 1947, the state of
Washington was designated as a single
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was designated nationwide as a dialing code for the
472:Telecommunications-related introductions in 1956
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179:List of North American Numbering Plan area codes
16:Telephone area code for eastern Washington state
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110:(AT&T) devised the first nationwide
108:American Telephone and Telegraph Company
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213:"2022-1 NRUF and NPA Exhaust Analysis"
174:List of Washington (state) area codes
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154:National Suicide Prevention Lifeline
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266:NANPA area code map of Washington
90:. The area code was assigned in a
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467:Area codes in Washington (state)
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36:North American Numbering Plan
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199:Notes on Distance Dialing
112:telephone numbering plan
131:direct distance dialing
218:. NANPA. April 1, 2022
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164:by October 24, 2021.
116:Operator Toll Dialing
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158:seven-digit dialing
146:central office code
120:numbering plan area
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162:ten-digit dialing
52:Cascade Mountains
30:is the telephone
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28:Area code 509
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377:area codes:
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245:. Retrieved
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220:. Retrieved
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42:part of the
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387:778/236/672
84:Walla Walla
456:Categories
438:47°N 118°W
273:Washington
185:References
76:Ellensburg
48:Washington
44:U.S. state
106:When the
98:in 1956.
88:Wenatchee
72:Kennewick
32:area code
443:47; -118
247:March 9,
222:March 4,
168:See also
64:Richland
413:541/458
409:503/971
398:208/986
366:541/458
353:208/986
102:History
56:Spokane
40:eastern
34:in the
405:Oregon
86:, and
80:Yakima
70:, and
429:118°W
394:Idaho
362:South
306:North
241:(PDF)
216:(PDF)
92:split
68:Pasco
426:47°N
349:East
331:West
249:2021
224:2023
122:and
114:for
383:604
379:250
344:509
339:425
335:360
322:672
318:236
314:778
310:250
297:564
293:509
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150:988
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
