Whitehall is a town in Jefferson County, Montana, United States. The population was 1,006 at the 2020 census. It is part of the Helena Micropolitan Statistical Area. Whitehall began as a rail depot created by the Northern Pacific and Montana Railroad on September 25, 1889. The name for the depot came from E.G. Brooke, who was inspired by a si…Whitehall is a town in Jefferson County, Montana, United States. The population was 1,006 at the 2020 census. It is part of the Helena Micropolitan Statistical Area. Whitehall began as a rail depot created by the Northern Pacific and Montana Railroad on September 25, 1889. The name for the depot came from E.G. Brooke, who was inspired by a similar town in which he stayed in Illinois while making his way westward. On September 3, 1890, the Jefferson County Commissioners accepted and filed the Townsite of Whitehall.