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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 |
|---|---|---|---|---|
| Ritzville | Adams | 0104 | Schrag Nichols Annexation | 2138 |
| Kennewick | Benton | 0302 | 5863 | |
| Forks | Clallam | 0501 | Folkner Annexation | 645 |
| Battle Ground | Clark | 0601 | Grace Annexation | 2020-01 |
| Kalama | Cowlitz | 0802 | Guffey Annexation | 1435 |
| Connell | Franklin | 1101 | 1008-2020 | |
| Mattawa | Grant | 1308 | City of Mattawa Wasterwater Treatment Facility Annexation | 20-628 |
| Moses Lake | Grant | 1309 | Forever-ODM Annexation | 2944 |
| Ellensburg | Kittitas | 1902 | Currier Creek Annexation Area | 4847 |
| Omak | Okanogan | 2407 | 1887 | |
| Fife | Pierce | 2706 | res. 1921 | |
| Fife | Pierce | 2706 | res. 1868 | |
| Milton | Pierce | 2709 | res. 20-19 | |
| Tacoma | Pierce | 2717 | res. 40540 | |
| Friday Harbor | San Juan | 2801 | 1685 | |
| Sedro-Woolley | Skagit | 2908 | Falklands Annexation | 1951-20 |
| Arlington | Snohomish | 3101 | Butler Wetland Annexation | 2019-012 |
| Arlington | Snohomish | 3101 | 2020-004 |
