Gallatin County, Montana

Gallatin County
County
Gallatin County Courthouse in Bozeman
Seal
Location within the U.S. state of Montana
Montana's location within the U.S.
Coordinates: 45°34′N 111°10′W / 45.56°N 111.17°W / 45.56; -111.17
Country	United States
State	Montana
Founded	1865
Named for	Gallatin River (Albert Gallatin)
Seat	Bozeman
Largest city	Bozeman
Area
• Total	2,632 sq mi (6,820 km2)
• Land	2,603 sq mi (6,740 km2)
• Water	29 sq mi (80 km2)  1.1%
Population  (2020)
• Total	118,960
• Estimate  (2022)	124,938
• Density	45/sq mi (17/km2)
Time zone	UTC−7 (Mountain)
• Summer (DST)	UTC−6 (MDT)
Congressional district	1st
Website	www.gallatin.mt.gov
Montana county number 06

Gallatin County is a county located in the U.S. state of Montana. With its county seat in Bozeman, it is the second-most populous county in Montana, with a population of 118,960 in the 2020 Census.^[1]

The county's prominent geographical features are the Bridger mountains in the north, and the Gallatin mountains and Gallatin River in the south, named by Meriwether Lewis in 1805 for Albert Gallatin,^[2] the United States Treasury Secretary who formulated the Lewis and Clark Expedition.

At the southern end of the county, West Yellowstone's entrance into Yellowstone National Park accounts for around half of all park visitors. Big Sky Resort, one of the largest ski resorts in the United States, lies in Gallatin and neighboring Madison counties, midway between Bozeman and West Yellowstone.