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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 |
|---|---|---|---|---|
| LaCenter | Clark | 0603 | Stephens-Rerick | 2017-14 |
| Pasco | Franklin | 1104 | Four-Acre Road 68 Annexation | 4354 |
| Newport | Pend Oreille | 2605 | 2-56 MH Tax 5 AS ext and Tax 19 Less Tax 18 | 2042 |
| Fircrest | Pierce | 2707 | 62nd Ave W & 44th St W | 1612 |
| Lynnwood | Snohomish | 3110 | Calvary Annexation | 3282 |
| Lacey | Thurston | 3402 | 1518 | |
| Colfax | Whitman | 3802 | Wastewater Treatment Lagoon | 17-04 |
| Moxee | Yakima | 3905 | Dorais Annexation | 774 |
| Naches | Yakima | 3906 | Naches Valley School District #JT3 | 721 |
| Naches | Yakima | 3906 | Spinner Wood Products, LLC and Ronald & Caroline Deaton | 722 |
| Naches | Yakima | 3906 | John & Lynn Devore | 723 |
| Naches | Yakima | 3906 | Allan Bros., Inc. & David & Renee Silvestri | 724 |
| Selah | Yakima | 3907 | MKKI Annexation | 2030 |
| Selah | Yakima | 3907 | Graf Annexation | 2033 |
| Sunnyside | Yakima | 3908 | Messmore Annexation | 2015-17 |
