News Headlines Ione Band of Miwok Indians signs developer for Plymouth casino project Octo.
The other two are the Harrah's Northern California Casino in Ione and Jackson Rancheria Casino in Jackson. The Ione Band of Miwoks Casino will be the third casino in Amador County. There will be two dining venues, coffee bar and a sports bar. The casino will be located in Amador County along Highway 49 in Plymouth, California and feature Class III slot machines and table games. Ione Band Casino is an Indian gaming casino owned by the Ione Band of Miwoks.