Belgrade is a city in Gallatin County, Montana, United States. The population was 10,460 at the 2020 census. Belgrade is part of the Bozeman, MT Micropolitan Statistical Area. It is the most populous city in Montana that is not a county seat. Belgrade and the surrounding areas experienced a significant population growth from 2010 to 2020. The 2010 city population from the US Census was 7,389, over 3,000 fewer than in 2020.