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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 |
|---|---|---|---|---|
| Leavenworth | Chelan | 0404 | Parcel #241711420100 Annexation | 1560 |
| Le Center | Clark | 0603 | Prouty Annexation | 2018-01 |
| Washougal | Clark | 0606 | Stalnaker Annexation | 1836 |
| Mattawa | Grant | 1308 | Sonrise Orchards | 17-607 |
| Quincy | Grant | 1310 | Western Sunset LLC Property | 18-513 |
| Montesano | Grays Harbor | 1406 | Woods at Sylvia Creek Annexation | 1594 |
| Montesano | Grays Harbor | 1406 | Gordon Bagnell & Beacon Storage Park | 1610 |
| Montesano | Grays Harbor | 1406 | Jason Heiner | 1611 |
| Oakville | Grays Harbor | 1407 | Regional Event Center Annexation | 612 |
| Renton | King | 1725 | Eric Ressler II Annexation | 5879 |
| Lacey | Thurston | 3402 | Gateway Division 2 | 1521 |
| Tumwater | Thurston | 3406 | Littlerock Rd North Annexation | 02017-031 |
| Tumwater | Thurston | 3406 | Littlerock Rd South Annexation | 02017-032 |
| Grandview | Yakima | 3901 | Port of Grandview & Higgins Family Annexation | 2018-1 |
| Yakima | Yakima | 3913 | Fairway Annexation | 2017-036 |
