Area code 509
Area code 509 is the telephone
History
When the
With the build-out of the toll dialing system, and the beginnings of conversion for direct distance dialing by subscribers, AT&T divided the numbering plan area and designated the eastern part with area code 509 in 1956.
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.
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.[2]
Prior to October 2021, area code 509 had telephone numbers assigned for the
See also
References
- ^ Notes on Distance Dialing. American Telephone and Telegraph Company. September 1956. p. Sec II-App A-1.
- ^ "2022-1 NRUF and NPA Exhaust Analysis" (PDF). NANPA. April 1, 2022. Retrieved March 4, 2023.
- ^ "Transition to 10-digit dialing (for 988 as 3-digit access to National Suicide Prevention Hotline)" (PDF). North American Numbering Plan Administrator. January 8, 2021. Retrieved March 9, 2021.
External links
North: 672
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West: 360, 425 | 509 | East: 208/986 |
South: 541/458 | ||
British Columbia area codes: 236/672/778, 250, 604 | ||
Idaho area codes: 208/986 | ||
Oregon area codes: 458/541, 503/971 |