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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 |
|---|---|---|---|---|
| Camas | Clark | 0602 | 21-008 | |
| Enumclaw | King | 1711 | Mount Rainier Christian Church Annexation | 2691 |
| Enumclaw | King | 1711 | Mount Rainier Christian Church Annexation | 2706 |
| Everett | King | 3105 | Smith Island West Annexation | 3801-21 |
| Everson | Whatcom | 3703 | Flint West Everson Annexation | 826-21 |
| Grandview | Yakima | 3901 | Buettner Annexation | 2021-13 |
| Kennewick | Benton | 0302 | 5926 | |
| Lacey | Thurston | 3402 | Steilacoom/Marvin Annexation | 1589 |
| Lacey | Thurston | 3402 | Mosure 54th Ave Annexation | 1590 |
| Lacey | Thurston | 3402 | Capitol City/Chambers Estates Annexation | 1596 |
| Lake Stevens | Snohomish | 3109 | Southeast UGA Annexation | 1112 |
| Liberty Lake | Spokane | 3212 | 278 | |
| Mattawa | Grant | 1308 | 20-640 | |
| Newport | Pend Orielle | 2605 | 2083 | |
| Pasco | Franklin | 1104 | J&J Kelly Construction Annexation | 4527 |
| Pasco | Franklin | 1104 | Cox Family Land LLC Annexation | 4546 |
| Prosser | Benton | 0303 | 21-3136 | |
| Prosser | Benton | 0303 | 21-3137 | |
| Prosser | Benton | 0303 | 21-3138 | |
| Prosser | Benton | 0303 | 21-3139 | |
| Prosser | Benton | 0303 | 21-3141 | |
| Pullman | Whitman | 3812 | Bishop Annexation | 21-5 |
| Puyallup | Pierce | 2711 | Freeman Road Annexation Area | 3229 |
| Raymond | Pacific | 2503 | Angelovich Annexation | 1901 |
| Richland | Benton | 0304 | 11-21 | |
| Richland | Benton | 0304 | 12-21 | |
| Ridgefield | Clark | 0604 | Potter Annexation | 1347 |
| Ritzville | Adams | 0104 | Grainland Acres Addition | 2150 |
| Sedro Woolley | Skagit | 2908 | Valley High Investment Annexation | 1985-21 |
| Sultan | Snohomish | 3117 | Tortorice Annexation | 1349-21 |
| Walla Walla | Walla Walla | 3604 | 2021-07 | |
| Walla Walla | Walla Walla | 3604 | 2021-08 | |
| Walla Walla | Walla Walla | 3604 | Nelson Irrigation Annexation | 2021-108 |
| Walla Walla | Walla Walla | 3604 | Barney Drive and Pleasant Street Annexation | 2021-16 |
| Walla Walla | Walla Walla | 3604 | Artesia Annexation | 2021-17 |
| Walla Walla | Walla Walla | 3604 | Hatch Annexation | 2021-18 |
| Washougal | Clark | 0606 | Frye Annexation | 1944 |
| Wenatchee | Chelan | 0405 | Skyline Annexation | 2021-17 |
| Wenatchee | Chelan | 0405 | Martinez Annexation | 2021-18 |
| Wenatchee | Chelan | 0405 | 2021-21 | |
| Winthrop | Okanogan | 2413 | 745 |
