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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 (This form can only be accessed by King County employees. If you are a supplier that needs to fill out this form, please reach out to your point of contact at King County to complete this form.)

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

iExpense Proxy Travel & Expense Form (This form will not work in your browser. It only works in the Adobe Acrobat Reader. Please save the file to your computer by right clicking on the link and choosing "Save link as". From there, open it in the Adobe Acrobat Reader.)

Contact Us

Phone: 206-263-9400

TTY Relay: 711

Fax: 206-296-7676