Westby is a town in Sheridan County, Montana, United States. The population was 167 at the 2020 census.
History
Westby was founded in 1910 as a town in what was then Williams County, North Dakota (now in Divide County). Danish settlers came up with the name by combining the word west, which noted the town's location in extreme western North Dakota, with the word by, Danish for town. The town remained in North Dakota until 1914, when it was moved slightly across the border so as to be next to a newly built branch line of the Soo Line Railroad and in a state that permitted the sale of alcohol.
Geography
According to the United States Census Bureau, the town has a total area of , all land.
Westby is located on the state border with North Dakota, and near the international boundary with Saskatchewan. Montana Highway 5 passes through the town.
Climate
According to the Köppen Climate Classification system, Westby has a humid continental climate, abbreviated "DFb" on climate maps.