Oregon features eight Tribal Casinos located throughout the state. . your luck at one of The Mill Casino's over slot machines or Vegas-style table games!. The big payouts keep coming at Wildhorse Resort & Casino. Over $8 MILLION in hand-paid Jackpots were won in May ! Best Slots in Oregon! You'll find. Throughout the Pacific Northwest region, you will find quite a few Native American-operated casinos with slot machines, table games and a variety of other.