King County has announced that they will start processing Same-Sex Marriage licenses on December 6, 2012. Because of the expected high demand, all Service Center staff will be assisting at the King County Administration Building in downtown Seattle that day. The address is: 500 Fourth Ave. – Room #311 / Seattle, Wa. 98104. Their phone number is (206) 296-4021. The K. C. Service Center will be operational at Sammamish city hall the following week (Dec. 13), with their usual operating hours (Noon to 3:30 & 4:00 to 7:00 P.M.).