Sorry, I made a typo, yes, I meant serve on the prosecutor. I also confirmed I can file with any King County Courthouse, so that's very helpful info.

Hopefully one last question about discovery. Barry's template shows place for Case No. However, the Notice of Hearing does not have that anywhere that I can see. Only Ticket number (which matches the Infraction # exactly). So I assume I use that.

Reference from Template Guide: The “Case No.” should be the case number shown on your hearing notice. It may be slightly different from the Citation Number on your ticket.