From Wikipedia, the free encyclopedia - Bozeman, Montana is in County Gallatin and has a population of around 27,500. Bozeman is a city in southwestern Montana, USA. It is the county seat of Gallatin County. With a 2000 population of 27,509, Bozeman is the fifth largest city in the state. The city is named after John M. Bozeman, founder of the Bozeman Trail. Located in the fastest-growing county in the state, Bozeman is an All-America City. Bozeman residents are known as Bozemanites. There is excellent trout fishing to be found in the Gallatin River. A great place for Bozeman news is www.bozone.com .