CITY · MT

What county is Missoula, MT in?

Missoula, MT is mostly in Missoula County. County FIPS code 30063, population 121,849 (2023 estimate).

County details

City: Missoula, Montana
Primary county: Missoula County
FIPS code: 30063
County population: 121,849

Some cities extend into more than one county. Missoula is placed in the county that contains its center. For a specific address, use the address lookup.

Questions

What county is Missoula in?

Missoula, MT is mostly in Missoula County.

What is the county seat of Missoula County?

County seats are not part of the data on this site. Check the county’s official website.

Can a city be in two counties?

Yes. Large cities such as Houston and Atlanta cross county lines. The address lookup shows the exact county for any street address.

Sources: U.S. Census Bureau geographic reference files; FCC Area API; Census Bureau Population Estimates, Vintage 2023. Last reviewed 2026-10-27.