CITY · CO

What county is Denver, CO in?

Denver, CO is mostly in Denver County. County FIPS code 08031, population 716,577 (2023 estimate).

County details

City: Denver, Colorado
Primary county: Denver County
FIPS code: 08031
County population: 716,577

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

Questions

What county is Denver in?

Denver, CO is mostly in Denver County.

What is the county seat of Denver 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.