Gallatin County
County
Gallatin County Courthouse in Bozeman
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
• 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 found in the U.S. state of Montana. As of the 2020 United States Census, there were 118,960 people,^[1] making it the second-most populous county in Montana. Its county seat in Bozeman.^[2] A small part of Yellowstone National Park lies in the southeastern portion of the county.

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