CITY · CO

What county is Fort Collins, CO in?

Fort Collins, CO is mostly in Larimer County. County FIPS code 08069, population 370,771 (2023 estimate).

County details

City: Fort Collins, Colorado
Primary county: Larimer County
FIPS code: 08069
County population: 370,771

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

Questions

What county is Fort Collins in?

Fort Collins, CO is mostly in Larimer County.

What is the county seat of Larimer 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.