Here are our reviews of the ten largest US casinos and what they offer. Encore Boston Harbor in Everett, Massachusetts – 210,000 sq.Choctaw Casino Resort in Durant, Oklahoma – 218,844 sq.Yaamava Resort & Casino at San Manuel in Highland, California – 222,000 sq.Riverwind Casino in Norman, Oklahoma – 287,000 sq.Seminole Hard Rock Hotel & Casino in Tampa, Florida – 245,000 sq.Thunder Valley Casino Resort in Lincoln, California – 275,000 sq.Foxwoods Resort Casino in Mashantucket, Connecticut – 344,000 sq.Mohegan Sun Casino in Uncasville, Connecticut – 364,000 sq.WinStar World Casino & Resort in Thackerville, Oklahoma – 400,000 sq.Here’s a list of the ten biggest casinos in the US by the gambling area’s square footage and the number of games.