Where is Valley County?

3 Valley Counties in 3 states · 24,310 people (2025)

There are 3 counties named Valley County in the United States, in Idaho, Montana and Nebraska. The most populous is Valley County, Idaho (county seat: Cascade), with 12,831 people in 2025.

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

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

StateCounty seatPopulation 2025Land area (sq mi)EstablishedNamed after
Valley County, IdahoCascade12,8313,6651917–
Valley County, MontanaGlasgow7,3854,9261893–
Valley County, NebraskaOrd4,0945681871–

Questions about Valley Counties

How many Valley Counties are there?

There are 3 Valley Counties in the United States, in Idaho, Montana and Nebraska.

Which Valley County is the largest?

By population, Valley County, Idaho (12,831 people in 2025). By land area, Valley County, Montana (4,926 sq mi).

Which Valley County is the oldest?

Valley County, Nebraska, established in 1871. The newest is Valley County, Idaho (1917).

How do I find out which Valley 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