Cascade County, MT
The fifth most populous county in the state, Cascase County was founded in 1887 and named for the falls on the Missouri river. The largest city within its limits is Great Falls, also known as the “Electric City” because of the many dams and powerplants in the area. There is an estimated 81,643 residents in Cascade County.
Flathead County, MT
Named for the Flathead Indians, the county was established in 1893. It’s largest city, Kalispell, is known as the gateway to Glacier National Park. Flathead Lake is within its boundaries and is the largest natural freshwater lake in the United States. Population estimates for the county came in at 102,106 as of 2018.
Gallatin County, MT
Gallatin County was established in 1865 and was named for the Gallatin River. There are two statues of Sacajawea located in Gallatin County. The county defined its present boundaries in 1978, encompassing 2,632 square miles. An estimated 111,876 residents call Gallatin County home, making it the third most populous county in the state.
Missoula County, MT
Missoula County was founded on December 14, 1860. The area covers 2,618 square miles and the area is well known for its blue-ribbon trout fishing. The world’s largest gold nugget was mined at the Atlantic Cable Quartz Lode near the end of the 19th century. An estimated 118,791 individuals reside in the county, making it the second most populous county in the state.
Yellowstone County, MT
Yellowstone County was founded on February 26, 1883, six years before Montana became a state. It covers an area of 2,649 square miles and its largest city is Billings. The name was taken from the Yellowstone River, which runs through the county. The county is the most populous in the state with an estimated population of 160,137.