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69 prefixes in 509 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 509-221 | KENNEWICK | 4324 | 2013-08-07 | Yes |
| 509-222 | KENNEWICK | 4324 | — | Yes |
| 509-223 | LOOMIS | 4423 | — | Yes |
| 509-246 | SOAP LAKE | 4324 | — | Yes |
| 509-283 | ROCKFORD | 4324 | — | Yes |
| 509-284 | TEKOA | 4324 | — | Yes |
| 509-285 | OAKESDALE | 4324 | — | Yes |
| 509-286 | ROCKFORD | 4324 | — | Yes |
| 509-287 | FARMINGTON | 4324 | — | Yes |
| 509-291 | ROCKFORD | 4324 | — | Yes |
| 509-332 | PULLMAN | 4324 | — | Yes |
| 509-333 | PULLMAN | 4324 | — | — |
| 509-334 | PULLMAN | 4324 | — | — |
| 509-335 | PULLMAN | 4324 | — | — |
| 509-336 | PULLMAN | 4324 | — | Yes |
| 509-338 | PULLMAN | 4324 | — | Yes |
| 509-339 | PULLMAN | 4324 | — | Yes |
| 509-371 | RICHLAND | 4324 | — | Yes |
| 509-372 | RICHLAND | 4324 | — | — |
| 509-373 | RICHLAND | 4324 | — | — |
| 509-374 | KENNEWICK | 4324 | — | Yes |
| 509-375 | RICHLAND | 4324 | — | — |
| 509-376 | RICHLAND | 4324 | — | — |
| 509-447 | NEWPORT | 4324 | — | Yes |
| 509-478 | ROSALIA | 4324 | — | Yes |
| 509-485 | MOLSON | 4423 | — | Yes |
| 509-486 | TONASKET | 4423 | — | Yes |
| 509-523 | ROSALIA | 4324 | — | Yes |
| 509-548 | WENATCHEE | 4324 | — | — |
| 509-569 | ROSALIA | 4324 | — | Yes |
| 509-582 | KENNEWICK | 4324 | — | — |
| 509-585 | KENNEWICK | 4324 | — | — |
| 509-588 | BENTONCITY | 4324 | — | Yes |
| 509-628 | KENNEWICK | 4324 | — | Yes |
| 509-635 | GARFIELD | 4324 | — | Yes |
| 509-653 | NACHES | 4423 | — | Yes |
| 509-658 | NILE | 4423 | — | Yes |
| 509-662 | WENATCHEE | 4324 | — | — |
| 509-663 | WENATCHEE | 4324 | — | — |
| 509-664 | WENATCHEE | 4324 | — | — |
| 509-665 | WENATCHEE | 4324 | — | — |
| 509-667 | WENATCHEE | 4324 | — | — |
| 509-682 | WENATCHEE | 4324 | — | — |
| 509-683 | DOUGLASCO | 4324 | — | Yes |
| 509-686 | BRIDGEPORT | 4324 | — | Yes |
| 509-687 | WENATCHEE | 4324 | — | Yes |
| 509-689 | BREWSTER | 4324 | — | Yes |
| 509-734 | KENNEWICK | 4324 | — | — |
| 509-735 | KENNEWICK | 4324 | — | — |
| 509-736 | KENNEWICK | 4324 | — | — |
| 509-737 | KENNEWICK | 4324 | — | Yes |
| 509-745 | DOUGLASCO | 4324 | — | Yes |
| 509-763 | WENATCHEE | 4324 | — | Yes |
| 509-775 | REPUBLIC | 4423 | — | Yes |
| 509-779 | CURLEW | 4423 | — | Yes |
| 509-782 | WENATCHEE | 4324 | — | — |
| 509-783 | KENNEWICK | 4324 | — | — |
| 509-784 | WENATCHEE | 4324 | — | Yes |
| 509-785 | GEORGE | 4324 | — | Yes |
| 509-787 | QUINCY | 4324 | — | — |
| 509-872 | GARRISON | 4321 | — | Yes |
| 509-878 | PALOUSE | 4324 | — | Yes |
| 509-881 | WENATCHEE | 4324 | — | Yes |
| 509-884 | WENATCHEE | 4324 | — | — |
| 509-886 | WENATCHEE | 4324 | — | — |
| 509-942 | RICHLAND | 4324 | — | Yes |
| 509-943 | RICHLAND | 4324 | — | — |
| 509-946 | RICHLAND | 4324 | — | — |
| 509-967 | RICHLAND | 4324 | — | — |
These are initial assignees from NANPA CO-code records — because of number portability, the current serving carrier of individual numbers may differ. Bulk export requires a membership.