Oregon only allows Indian Casinos. The nearest one to Portland is the Grand Ronde, about 80 miles. Seattle does not allow casinos inside the City Limits. There are numerous Mini-Casinos (table games, no slots or Craps) in the surrounding suburbs. Look at the link below and check a map to find the area near where you are staying. The nearest Indian Casinos are all about thirty mile from Seattle: Muckleshoot in Auburn (the largest), Emerald Queen in Tacoma & Tulalip in Everett. Good luck.