Missoula County, Montana

Missoula County ( ) is a county located in the state of Montana. As of the 2020 census, the population was 117,922, making it Montana's third most populous county. Its county seat and most populous city is Missoula. The county was founded in 1860. Missoula County comprises the Missoula, MT Metropolitan Statistical Area, and is not a consolidated city-county.