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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 |
|---|---|---|---|---|
| Carnation | King | 1707 | 26-1033 | |
| Electric City | Grant | 1300 | De-Annexation | 2025-10 |
| Elma | Grays Harbor | 1403 | 1181 | |
| Ridgefield | Clark | 0604 | Kelly Windy Hills Annexation Windy Hills Phase 2 Annexation |
1472 1474 |
| South Cle Elum | Kittitas | 1905 | 658 | |
| Sunnyside | Yakima | 3908 | Sunset Ridge Annexation | 2025-11 |
| Tumwater | Thurston | 3406 | 02026-001 | |
| West Richard | Benton | 0305 | 19-25 | |
| Yelm | Thurston | 3407 | Yelm Annexation Area | 1142 |