Musselshell County, Montana
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Musselshell County is a county in south-central Montana. As of the 2020 census, the population was 4,730. Its county seat is Roundup.
The Musselshell County Courthouse in Roundup
Yellowstone County, Montana
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Yellowstone County is a county in the U.S. state of Montana. As of the 2020 census, the population was 164,731, and was estimated to be 172,692 in 2025, making it the most populous county in Montana.
Musselshell County, Montana
…was 4,730. Its county seat is Roundup. Musselshell County was created in 1911 by Montana Governor Edwin L. Norris. The area was taken from Fergus, Yellowstone, and Meagher counties. It was named for the Musselshell River which runs southwest–northeast through the county. That river had been thus named in 1805…
The Yellowstone County Courthouse in Billings in 2024