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The cities below have imposed annexations increasing their boundaries. Sales tax rates for businesses included in the annexation may be affected. More information can be obtained from the respective city planning departments.
| City | County | Location Code | Annexation Name | Ordinance Number |
|---|---|---|---|---|
| Battle Ground | Clark | 601 | Walker Annexation | 2019-07 |
| College Place | Walla Walla | 3601 | Preas-Maidment Annexation | 19-007 |
| Ellensburg | Kittitas | 1902 | Willard Annexation of Parcel 10879 | 4825 |
| Fife | Pierce | 2706 | Res 1856 | |
| Lake Stevens | Snohomish | 3109 | Rhodora Annexation | 1041 |
| Milton | Pierce | 2709 | Res 1008 | |
| Monroe | Snohomish | 3112 | Mainvue/Stahl Annexation Area | 002-2019 |
| Newport | Pend Oreille | 2605 | 2060 | |
| Pasco | Franklin | 1104 | Road 52 Fire Station & Park Annexation | 4428 |
| Prosser | Benton | 303 | David and Teresa Stockdale Annexation | 19-3083 |
| Pullman | Whitman | 3812 | Quist Annexation | 19-4 |
| Renton | King | 1725 | Wolf Woods Annexation | 5919 |
| Royal City | Grant | 1311 | 08-06 | |
| Washougal | Clark | 606 | Hickey-Nesbitt-Farrell Annexation | 1878 |
