Area code 509 is the telephone area code for the eastern two-thirds of the state of Washington. The western boundary of 509 roughly follows the Cascades. The 509 area code includes Spokane, the Tri-Cities (Richland, Pasco, and Kennewick), Ellensburg, Yakima, Walla Walla, and Wenatchee. The 509 code was created in a split from 206, originally the area code for all of Washington, in a flash-cut on January 1, 1957.
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| - Area code 509 (en)
- Indicatif régional 509 (fr)
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| - L'indicatif régional 509 est l'un des indicatifs téléphoniques régionaux de l'État de Washington. Cet indicatif dessert un territoire situé à l'ouest de l'État. La carte ci-contre indique en turquoise le territoire couvert par l'indicatif 509. L'indicatif régional 509 fait partie du plan de numérotation nord-américain. (fr)
- Area code 509 is the telephone area code for the eastern two-thirds of the state of Washington. The western boundary of 509 roughly follows the Cascades. The 509 area code includes Spokane, the Tri-Cities (Richland, Pasco, and Kennewick), Ellensburg, Yakima, Walla Walla, and Wenatchee. The 509 code was created in a split from 206, originally the area code for all of Washington, in a flash-cut on January 1, 1957. (en)
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| - Prosser, Washington
- Pullman, Washington
- Benton City, Washington
- Area code 206
- Area code 250
- Area code 360
- Area code 425
- Area codes 208 and 986
- Area codes 541 and 458
- Area codes in Washington (state)
- Area codes in the United States
- Telecommunications-related introductions in 1957
- Richland, Washington
- Ritzville, Washington
- Area code 778
- North American Numbering Plan
- Colville, Washington
- Clarkston, Washington
- Cle Elum, Washington
- Colfax, Washington
- Ellensburg, Washington
- Ephrata, Washington
- Moses Lake, Washington
- Liberty Lake, Washington
- Stevenson, Washington
- Overlay plan
- Toppenish, Washington
- Tri-Cities, Washington
- Walla Walla, Washington
- Washington (state)
- Wenatchee, Washington
- Eastern Washington
- Pasco, Washington
- Area code
- Chelan County, Washington
- Cheney, Washington
- Chewelah, Washington
- Kennewick, Washington
- Spokane, Washington
- National Suicide Prevention Lifeline
- Omak, Washington
- Yakima, Washington
- Cascade Mountains
- Ten-digit dialing
- Area code 236
- Area code 672
- Seven-digit dialing
- Washington area codes
- Central office code
- Flash-cut
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| - Area code 509 is the telephone area code for the eastern two-thirds of the state of Washington. The western boundary of 509 roughly follows the Cascades. The 509 area code includes Spokane, the Tri-Cities (Richland, Pasco, and Kennewick), Ellensburg, Yakima, Walla Walla, and Wenatchee. The 509 code was created in a split from 206, originally the area code for all of Washington, in a flash-cut on January 1, 1957. This part of Washington is not as densely populated as the west, and the great majority of the state's landlines and cell phones are located west of the Cascades. As a result, while western Washington went from one area code to four during the 1990s, 509 has remained unchanged for over 60 years. That said, with the proliferation of cell phones (particularly in Spokane, Yakima, and the Tri-Cities), 509 is close to exhaustion and will likely require an overlay with a second area code by 2025. Prior to October 2021, area code 509 had telephone numbers assigned for the central office code 988. In 2020, 988 was designated nationwide as a dialing code for the National Suicide Prevention Lifeline, which created a conflict for exchanges that permit seven-digit dialing. This area code was therefore scheduled to transition to ten-digit dialing by October 24, 2021. (en)
- L'indicatif régional 509 est l'un des indicatifs téléphoniques régionaux de l'État de Washington. Cet indicatif dessert un territoire situé à l'ouest de l'État. La carte ci-contre indique en turquoise le territoire couvert par l'indicatif 509. L'indicatif régional 509 fait partie du plan de numérotation nord-américain. (fr)
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