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Submit invoices to

King County Accounts Payable
401 Fifth Ave, Ste 323
Seattle, WA 98104-1818

Please allow 10 business days for processing.

Update vendor payment address

We'll need your... 

1.  PO number (7 digits)
2.  Copy of the invoice
Contact Us

Phone: (206) 263-9400

TTY Relay: 711

Fax: (206) 296-7676