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Annexations and municipal boundary changes

Per RCW 35.13.260 and RCW 35A.14.700, jurisdictions must send annexation paperwork to the Office of Financial Management (OFM) within 30 days of the annexation effective date. OFM approval is necessary for a city to qualify for revenues related to population.

Per agreement with the U.S. Census Bureau (USCB), OFM will submit boundary changes on behalf of Washington state’s jurisdictions to the USCB. The USCB will not accept any annexation or boundary line adjustment that has not been certified by OFM. Timely submission of any boundary change to OFM is critical. Missed boundary changes can negatively affect the federal funding for local governments, population estimates for sub county areas, and the American Community Survey program.

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Information for cities conducting an annexation

Reports and data