CITY · WY

What county is Cheyenne, WY in?

Cheyenne, WY is mostly in Laramie County. County FIPS code 56021, population 100,984 (2023 estimate).

County details

City: Cheyenne, Wyoming
Primary county: Laramie County
FIPS code: 56021
County population: 100,984

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

Questions

What county is Cheyenne in?

Cheyenne, WY is mostly in Laramie County.

What is the county seat of Laramie 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.