Area code 509 is the telephone

area code A telephone numbering plan is a type of numbering scheme used in telecommunication to assign telephone numbers to subscriber telephones or other telephony endpoints. Telephone numbers are the addresses of participants in a telephone network, r ...

for the eastern two-thirds of the state of

Washington Washington commonly refers to: * Washington (state), United States * Washington, D.C., the capital of the United States ** A metonym for the federal government of the United States ** Washington metropolitan area, the metropolitan area centered o ...

. The western boundary of 509 roughly follows the Cascades. The 509 area code includes Spokane, the Tri-Cities ( Richland, Pasco, and Kennewick),

Ellensburg Ellensburg is a city in and the county seat of Kittitas County, Washington, United States. It is located just east of the Cascade Range near the junction of Interstate 90 and Interstate 82. The population was 18,666 at the 2020 census. and wa ...

, Yakima, Walla Walla, and Wenatchee. The 509 code was created in a split from

206 Year 206 ( CCVI) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Umbrius and Gavius (or, less frequently, year 959 ''Ab urbe condit ...

, originally the area code for all of Washington, in a

flash-cut A flash cut, also called a flash cutover, is an immediate change in a complex system, with no phase-in period. In the United States, some telephone area codes were split or overlaid immediately, rather than being phased in with a permissive d ...

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 Overlay may refer to: Computers *Overlay network, a computer network which is built on top of another network *Hardware overlay, one type of video overlay that uses memory dedicated to the application *Another term for exec, replacing one process ...

with a second area code by 2025.https://nationalnanpa.com/reports/2022-1_NPA%20Exhaust_Projections.pdf 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 Seven-digit dialing is a telephone dialing procedure customary in some territories of the North American Numbering Plan (NANP) for dialing telephone numbers in the same numbering plan area (NPA). NANP telephone numbers consist of ten digits, of wh ...

. This area code was therefore scheduled to transition to ten-digit dialing by October 24, 2021.

Central office codes

Chewelah (509) - 935 937 Colfax (509)-397 Colville (509)-680 684 North Chelan County (509)-682 687 784 Cheney (509) -235 359 559 Pullman (509)-332 333 334 335 336 338 339 432 592 595 715 872 Spokane (509)-209 216 217 218 220 227 228 230 232 241 242 244 247 251 252 263 267 270 271 272 275 277 278 279 280 290 294 321 323 324 325 326 327 328 329 340 342 343 344 351 352 353 354 355 356 357 358 362 363 368 370 381 385 389 434 435 441 443 444 448 455 456 458 459 461 462 463 464 465 466 467 468 471 472 473 474 475 477 479 481 482 483 484 487 489 490 495 496 499 532 533 534 535 536 561 562 568 570 590 599 622 623 624 625 626 638 644 688 691 692 693 694 695 696 701 710 714 742 744 747 752 753 755 756 757 768 777 789 818 835 838 842 844 847 863 868 869 879 880 889 891 892 893 921 922 924 926 927 928 931 939 944 951 953 954 979 981 984 990 991 993 994 995 998 999 Premium service - 976 Walla Walla (509)-200 204 240 301 386 520 522 524 525 526 527 529 540 593 629 676 866 876 897 956 Wenatchee (509)-264 293 300 393 414 421 470 548 630 662 663 664 665 667 668 669 670 679 699 763 782 860 881 884 885 886 888 Yakima (509)-225 248 249 307 388 451 452 453 454 457 469 480 494 573 574 575 576 577 594 654 728 833 834 853 895 901 910 930 933 941 945 949 952 955 961 965 966 969 972 985 Kennewick (509)-205 222 294 308 330 366 374 378 380 392 396 438 460 515 551 581 582 584 585 586 591 619 627 628 727 734 735 736 737 783 947 948 987 Pasco (509)-302 430 492 521 528 530 531 539 542 543 544 545 546 547 567 845 851 Richland (509)-371 372 373 375 376 420 554 940 942 943 946 967 Clarkston (509)-254 295 552 751 758 769 780

(509)- 925 933 962 963 Ephrata (509)-237 281 289 398 717 754 Omak (509)-322 422 429 557 826 846 861 Ritzville (509)-347 428 650 659 660 Stevenson (509)-219 427

Moses Lake Moses Lake is a lake and reservoir along the course of Crab Creek, in Washington state, USA. Moses Lake is part of the Columbia River basin, as Crab Creek is a tributary of the Columbia River. Although originally a shallow natural lake, Moses ...

(509)-760 750 989 431 793 762 764 765 766 Other cities and towns in the 509 area code: *

Prosser Prosser may refer to: __NOTOC__ Places ;United States * Prosser, California, a former settlement * Prosser Creek, California * Prosser, Nebraska, a village * Prosser, Washington, a city ;Australia * Electoral division of Prosser, Tasmania * Prosser ...

* Cle Elum * Liberty Lake *

Toppenish Toppenish () is a city in Yakima County, Washington. As of the 2020 census, the city population was 8,854. It is located within the Yakama Indian Reservation, established in 1855. Toppenish calls itself the city of Murals, as it has more than 7 ...

* Benton City

References

External links

{{DEFAULTSORT:Area Code 509 509 509 Telecommunications-related introductions in 1957

Central office codes

See also

References

External links