Application form DS-11: This form must be filled out but not signed until you submit it at the post office. Passport Application Process at KINGS COUNTY CLERK.Use our Form Filler to fill out your form and print it. For the best experience, use a desktop or laptop computer. STEP 1: Complete and Print Form. Please visit the passport section at travel.state. US Passport or US Passport Card 2. Fill out your form(s) online and print it. All required supporting documents for the form(s). You can submit your US passport application at these King County District Court locations.