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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 |
|---|---|---|---|---|
| Aberdeen | Grays Harbor | 1401 | 6597 | |
| Blaine | Whatcom | 3702 | Toor Annexation | 14-2857 |
| Bonney Lake | Pierce | 2701 | 1548 | |
| Cashmere | Chelan | 0401 | 1253 | |
| Cashmere | Chelan | 0401 | 1254 | |
| College Place | Walla Walla | 3601 | 1140 | |
| Colville | Stevens | 3302 | Open Space | 1572 N.S. |
| Everett | Snohomish | 3105 | Smith Island Municpal | 3506-16 |
| Fife | Pierce | 2706 | WSDOT SR 167 | 1946 |
| George | Grant | 1304 | 2016-11 | |
| Kennewick | Benton | 302 | 5672 | |
| La Center | Clark | 0603 | Goode, et al | 2016-003 |
| La Center | Clark | 0603 | Interchange Devel. | 2016-06 |
| La Center | Clark | 0603 | Griffith Trust | 2016-08 |
| Lynden | Whatcom | 3705 | 1506 | |
| Lynden | Whatcom | 3705 | 1509 | |
| Mount Vernon | Skagit | 2907 | Little Mountain Park | 3676 |
| Mount Vernon | Skagit | 2907 | Little Mountain Park South | 3677 |
| Olympia | Thurston | 3403 | 7029 | |
| Oroville | Okanogan | 2408 | 852 | |
| Puyallup | Pierce | 2711 | 39th Ave SW | 3120 |
| Quincy | Grant | 1310 | 15-455 | |
| Quincy | Grant | 1310 | 16-468 | |
| Quincy | Grant | 1310 | 16-472 | |
| Ridgefield | Clark | 0604 | Brown Annexation | 1216 |
| Stanwood | Snohomish | 3116 | Tarte Annexation | 1422 |
| Stanwood | Snohomish | 3116 | Ovenell Annexation | 1425 |
| Walla Walla | Walla Walla | 3604 | Waitsburg RD/Hwy 12 | 2016-11 |
| Walla Walla | Walla Walla | 3604 | Mill Creek/Myra Rd | 2016-23 |
| Walla Walla | Walla Walla | 3604 | Taumarson/Higland | 2016-24 |
| Woodway | Snohomish | 3118 | Upper Bluff Annexation | 16-572 |
