Where is Fremont County?

4 Fremont Counties in 4 states · 110,233 people (2025)

There are 4 counties named Fremont County in the United States, in Colorado, Idaho, Iowa and Wyoming. The most populous is Fremont County, Colorado (county seat: Cañon City), with 50,039 people in 2025. 4 of them are named after John C. Frémont, American politician, explorer and military officer (1813–1890).

Map of the United States showing where all 4 Fremont Counties are, labeled by state
Every Fremont 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 4 Fremont Counties

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

StateCounty seatPopulation 2025Land area (sq mi)EstablishedNamed after
Fremont County, ColoradoCañon City50,0391,5341861John C. Frémont
Fremont County, IdahoSt. Anthony14,2081,8641893John C. Frémont
Fremont County, IowaSidney6,5225111847John C. Frémont
Fremont County, WyomingLander39,4649,1841884John C. Frémont

Questions about Fremont Counties

How many Fremont Counties are there?

There are 4 Fremont Counties in the United States, in Colorado, Idaho, Iowa and Wyoming.

Which Fremont County is the largest?

By population, Fremont County, Colorado (50,039 people in 2025). By land area, Fremont County, Wyoming (9,184 sq mi).

Which Fremont County is the oldest?

Fremont County, Iowa, established in 1847. The newest is Fremont County, Idaho (1893).

Why are there so many Fremont Counties?

4 of the 4 are named after John C. Frémont, American politician, explorer and military officer (1813–1890). Many counties took their names from the same founders, presidents and generals as new states were organized.

How do I find out which Fremont 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