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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 |
|---|---|---|---|---|
| Prosser | Benton | 0303 | 25-3268 25-3269 23-3204 |
|
| Cashmere | Chelan | 0401 | Barros Annexation | 1333 |
| Leavenworth | Chelan | 0404 | 1699 | |
| Battleground | Clark | 0601 | Winters Annexation | 2025-01 |
| Ridgefield | Clark | 0604 | Mukensnabl Annexation | 1446 |
| Longview | Cowlitz | 0804 | 5024 OBH Annexation | 3515 |
| Oak Harbor | Island | 1503 | 2016 | |
| Lacey | Thurston | 3402 | 1672 | |
| Walla Walla | Walla Walla | 3604 | Mill Creek Annexation | Res2025-029 |
| Lynden | Whatcom | 3705 | SW Annexation Gosal Annexation Proponent Annexation |
24-1692 25-1707 24-1687 |
| Moxee | Yakima | 3905 | Beaudry-Duffield Annexation | 853 |
| Selah | Yakima | 3907 | Hilltop Investment Group Annexation | 2241 |
