Fort Shaw is a census-designated place (CDP) in Cascade County, Montana, United States. The population was 280 at the 2010 census. Named for a former United States military outpost, it is part of the Great Falls, Montana Metropolitan Statistical Area.
Fort Shaw is located at 47°30′16″N 111°48′41″W (47.504313, -111.811348).
According to the United States Census Bureau, the CDP has a total area of 5.6 square miles (15 km2), all land.
As of the census of 2000, there were 274 people, 101 households, and 73 families residing in the CDP. The population density was 48.6 people per square mile (18.8/km2). There were 115 housing units at an average density of 20.4 per square mile (7.9/km2). The racial makeup of the CDP was 97.81% White, 0.73% Native American, and 1.46% from two or more races. Hispanic or Latino of any race were 1.46% of the population.
There were 101 households, out of which 34.7% had children under the age of 18 living with them, 59.4% were married couples living together, 7.9% had a female householder with no husband present, and 27.7% were non-families. 25.7% of all households were made up of individuals, and 12.9% had someone living alone who was 65 years of age or older.