Troy is a city in Lincoln County, Montana, United States. The population was 938 at the 2010 census.
Troy is located at 48°27′36″N 115°53′28″W (48.459944, -115.890974).
According to the United States Census Bureau, the city has a total area of 0.78 square miles (2.02 km2), of which, 0.76 square miles (1.97 km2) is land and 0.02 square miles (0.05 km2) is water. Troy has an elevation of about 1,800 feet above sea level and is the lowest town in elevation in Montana. Troy is 12 miles from the border of Montana and Idaho. Troy's next closest city is Libby, which is 18 miles away.
The Troy Mine, which produced silver and copper, was scheduled for closure in February 2015.
This climatic region is typified by large seasonal temperature differences, with warm to hot (and often humid) summers and cold (sometimes severely cold) winters. According to the Köppen Climate Classification system, Troy has a humid continental climate, abbreviated "Dsb" on climate maps. Troy's annual mean temperature is 46.4 °F (8.0 °C) and its annual mean precipitation is 24.6" (624.8 mm).
As of the census of 2010, there were 938 people, 454 households, and 240 families residing in the city. The population density was 1,234.2 inhabitants per square mile (476.5/km2).