SIZE
1,871 mi²
FOUNDED
1911
COUNTY SEAT
ROUNDUP
POPULATION
4,633
LARGEST CITY
ROUNDUP
COUNTY NUMBER
23
County Fun Fact
The name Musselshell comes from the mussel shells in the river named by Lewis and Clark. The county seat, Roundup, dons its name from the cattle roundups in the late 1800s.
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