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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 |
|---|---|---|---|---|
| Bellingham | Whatcom | 3701 | Bennett/Bakerview/Airport Drive Annexation | 2018-11-027 |
| Bellingham | Whatcom | 3701 | Mt. Baker Highway/Britton Road Annexation | 2018-12-033 |
| College Place | Walla Walla | 3601 | 19-002 | |
| Elma | Grays Harbor | 1403 | Cindy and Carey McAfee Annexation | 1173 |
| Ephrata | Grant | 1303 | McCreary/Highway 28 Area Annexation | 18-19 |
| Kalama | Cowlitz | 0802 | Cloverdale Road Pump Station Annexation | 1416 |
| Leavenworth | Chelan | 0404 | 1580 | |
| Liberty Lake | Spokane | 3212 | 256 | |
| Lynden | Whatcom | 3705 | 1561 | |
| Mossyrock | Lewis | 2104 | 345 | |
| Newport | Pend Oreille | 2605 | South Bench Annexation | 2052 |
| Newport | Pend Oreille | 2605 | South Bench Annexation | 2053 |
| Newport | Pend Oreille | 2605 | South Bench Annexation | 2054 |
| Newport | Pend Oreille | 2605 | South Bench Annexation | 2055 |
| Newport | Pend Oreille | 2605 | South Bench Annexation | 2056 |
| Poulsbo | Kitsap | 1803 | 76-8 | |
| Richland | Benton | 0304 | Lorayne J Annexation | 51-18 |
| Ridgefield | Clark | 0604 | Cosgrove Annexation | 1270 |
| Rock Island | Douglas | 0904 | Urban Growth Area Annexation | 18-168 |
| Wenatchee | Chelan | 0405 | Chelan Douglas Land Trust Annexation | 2018-40 |
