The tribes bought land outside of Mountain Home, in Elmore County, in January 2020, according to the Elmore County Assessor’s Office. The 154.5 acre parcel is southeast of the city and just west of …The tribes bought land outside of Mountain Home, in Elmore County, in January 2020, according to the Elmore County Assessor’s Office. The 154.5 acre parcel is southeast of the city and just west of …