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King County Courthouse Third Avenue entrance closed until January 1, 2020. Please use alternative routes.  
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W-9 Taxpayer Identification (King County Substitute W-9)  |  Instructions for Businesses  |  Instructions for Individuals 

Consultant Disclosure Form

Automated Clearing House (ACH) Authorization Agreement

Responsibility Detail and Attestation Form (not for use with construction contracts)

Contact Us

Phone: (206) 263-9400

TTY Relay: 711

Fax: (206) 296-7676