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Most King County offices will be closed on Monday, February 19, for President's Day.  
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W-9 Taxpayer Identification (King County Substitute W-9)  |  Instructions for Businesses  |  Instructions for Individuals 

Consultant Disclosure Form

Electronic Funds Transfer Authorization Agreement

Responsibility Detail and Attestation Form

Contact Us

Phone: (206) 263-9400

TTY Relay: 711

Fax: (206) 296-7676