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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 | Lynn Annexation | 2023-04 |
| Colfax | Whitman | 3802 | McGraw Annexation | 23-01 |
| Enumclaw | King | 1711 | Grace Point Church | 2749 |
| Lynden | Whatcom | 3705 | Benson Park Annexation | 1645 |
| Oak Harbor | Island | 1503 | Sullivan Annexation | 1968 |
| Quincy | Grant | 1310 | Blain Annexation | 23-592 |
| Quincy | Grant | 1310 | Rodgers Annexation | 23-593 |
| Ritzville | Adams | 104 | Reimer Addition | 2166 |
| Shelton | Mason | 2301 | Peacock Ridge | 1998-1222 |
| Starbuck | Columbia | 702 | Dedloff/Hays/Orem | 2021-172 |
| Sumner | Pierce | 2716 | Houston Road Annexation | 2832 |
| Washougal | Clark | 606 | Gesler Annexation | 1970 |
