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Annexations and municipal boundary changes

Central Annexation Tracking System

The purpose of this site is to provide a convenient location where federal and state agencies, local governments, organizations, and members of the public can obtain information about annexations. State agencies that use this site include WSDOT Geographic Services, DOR Tax Payer Account Administration, and DOR Property Tax Division.

Posting on this website does not replace reporting to DOR by counties and cities. RCW requirements are still in effect.

The electronic files shown here do not constitute legal documents. Legal versions are filed at OFM and copies can be obtained by contacting the Forecasting and Research Division at 360-902-0599.

Materials are posted when they are received by OFM and updated as appropriate. They may not be accurate until an OFM File Number is assigned. See the certificate to view the current status of an annexation.

*: Amending ordinance.
-: De-annexation.
N/A: A Section 508 accessible version of the ordinance is not available.
Blank: OFM is missing information or an OFM File Number is not yet assigned.

Central Annexations Table

Moxee - Ordinance 853
Ordinance Number: 853
Date Received: 04/23/2025
Effective Date: 04/20/2025
Approval Date: 05/05/2025
Mukilteo - Ordinance 1513
Oak Harbor - Ordinance 2016
Omak - Ordinance 1950
Othello - Ordinance 1635
Prosser - Ordinance 25-3268
Prosser - Ordinance 25-3269
Prosser - Ordinance 23-3204
Ridgefield - Ordinance 1446
Ridgefield - Ordinance 1451
Royal City - Ordinance 25-01
Selah - Ordinance 2241
Starbuck - Ordinance 2025-04*
Walla Walla - Ordinance Res. 2025-029