Where is Park County?

3 Park Counties in 3 states · 67,699 people (2025)

There are 3 counties named Park County in the United States, in Colorado, Montana and Wyoming. The most populous is Park County, Wyoming (county seat: Cody), with 31,171 people in 2025. 2 of them are named after Yellowstone National Park, first national park in the world, located in Wyoming, Montana, and Idaho in the United States.

Map of the United States showing where all 3 Park Counties are, labeled by state
Every Park County in the United States (red), labeled with its state. Boundaries: U.S. Census Bureau, 2025. Free to use with attribution (CC BY 4.0).

All 3 Park Counties

Sorted by state. Each link opens the county's map.

StateCounty seatPopulation 2025Land area (sq mi)EstablishedNamed after
Park County, ColoradoFairplay18,3142,1941861South Park
Park County, MontanaLivingston18,2142,8031887Yellowstone National Park
Park County, WyomingCody31,1716,9391909Yellowstone National Park

Questions about Park Counties

How many Park Counties are there?

There are 3 Park Counties in the United States, in Colorado, Montana and Wyoming.

Which Park County is the largest?

By population, Park County, Wyoming (31,171 people in 2025). By land area, Park County, Wyoming (6,939 sq mi).

Which Park County is the oldest?

Park County, Colorado, established in 1861. The newest is Park County, Wyoming (1909).

Why are there so many Park Counties?

2 of the 3 are named after Yellowstone National Park, first national park in the world, located in Wyoming, Montana, and Idaho in the United States. Many counties took their names from the same founders, presidents and generals as new states were organized.

How do I find out which Park County an address is in?

Open the county map of the state: it has a search box for cities, towns and ZIP codes. On a phone, the "what county am I in" tool on our sister site uses your location.

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Other common county names