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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 |
|---|---|---|---|---|
| City Battle Ground | County Clark County | Location Code 0601 | Annexation Name East Parkway Annexation | Ordinance Number 17-01 |
| City Lacey | County Thurston County | Location Code 3402 | Annexation Name North Thurston Public Schools Parcel | Ordinance Number 1509 |
| City Mattawa | County Grant County | Location Code 1308 | Annexation Name The Catholic Church | Ordinance Number 17-595 |
| City North Bonneville | County Skamania County | Location Code 3001 | Annexation Name | Ordinance Number 1077 |
| City Oak Harbor | County Island County | Location Code 1503 | Annexation Name | Ordinance Number 1795 |
| City Pasco | County Franklin County | Location Code 1104 | Annexation Name | Ordinance Number 4330 |
| City Prosser | County Benton County | Location Code 0303 | Annexation Name Prop. Btwn CR-12 and I-82 | Ordinance Number 17-2995 |
| City Prosser | County Benton County | Location Code 0303 | Annexation Name Panoramic Properties | Ordinance Number 17-2996 |
| City Washougal | County Clark County | Location Code 0606 | Annexation Name NW/UGA Annexation | Ordinance Number 1783 |
| City Wenatchee | County Chelan | Location Code 0405 | Annexation Name | Ordinance Number 2017-04 |
| City Wenatchee | County Chelan | Location Code 0405 | Annexation Name Saddlerock Municipal Annexation | Ordinance Number 2017-05 |
| City Yacolt | County Clark County | Location Code 0607 | Annexation Name | Ordinance Number 561 |
