What is the address for Seattle testing? January 15, 2021 09:08 Updated MasterPark Lot C, 16025 International Blvd, SeaTac, WA 98188 Related articles Where do I schedule an appointment? How long will it take to get my results? Can I request reimbursement from my insurance for these services? What should I expect when I arrive for my test? How does the PCR COVID test work?