Tarkio is an unincorporated community in Montana, United States, located in Mineral County. Tarkio falls in Mountain Time Zone (MST/MDT) and observes daylight saving time. Tarkio's elevation is above sea level, and is approximately outside of Missoula. It lies along Interstate 90 with access via exit 61. The Clark Fork River flows to the west. References External links Tarkio page from roadsidethoughts.com Unincorporated communities in Montana Unincorporated communities in Mineral County, Montana