Where is Platte County?

3 Platte Counties in 3 states · 158,683 people (2025)

There are 3 counties named Platte County in the United States, in Missouri, Nebraska and Wyoming. The most populous is Platte County, Missouri (county seat: Platte City), with 114,400 people in 2025. 2 of them are named after Platte River, river in Nebraska, United States.

Map of the United States showing where all 3 Platte Counties are, labeled by state
Every Platte 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 Platte Counties

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

StateCounty seatPopulation 2025Land area (sq mi)EstablishedNamed after
Platte County, MissouriPlatte City114,4004201838Platte River
Platte County, NebraskaColumbus35,6496751856Platte River
Platte County, WyomingWheatland8,6342,0821911North Platte River

Questions about Platte Counties

How many Platte Counties are there?

There are 3 Platte Counties in the United States, in Missouri, Nebraska and Wyoming.

Which Platte County is the largest?

By population, Platte County, Missouri (114,400 people in 2025). By land area, Platte County, Wyoming (2,082 sq mi).

Which Platte County is the oldest?

Platte County, Missouri, established in 1838. The newest is Platte County, Wyoming (1911).

Why are there so many Platte Counties?

2 of the 3 are named after Platte River, river in Nebraska, 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 Platte 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.

What county am I in? →

Other common county names