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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 |
|---|---|---|---|---|
| Forks | Clallam | 0501 | Decker Annexation | 685 |
| Grandview | Yakima | 3901 | Peacock & Harrison Annexation | 2025-11 |
| Kennewick | Benton | 0302 | 5215 S Washington Street | 25-6145 |
| Lake Stevens | Snohomish | 3109 | Fagerlie West Annexation | 1213 |
| Lynnwood | Snohomish | 3110 | Old Alderwood Middle School Annexation | 3488 |
| Monroe | Snohomish | 3112 | Corner Annexation | 022/2025 |
| Pasco | Franklin | 1104 | Wright & Big Sky Developers LLC Annexation | 4780 |
| Quincy | Grant | 1310 | AMJ Annexation | 26-644 |
| Ridgefield | Clark | 0604 | Oberreuter & Degenhardt Annexation | 1471 |
| Walla Walla | Walla Walla | 3604 | 2025-22 | |
| Warden | Grant | 1313 | 854 | |
| Wilkeson | Pierce | 2718 | 2025.06 |