Chinook is a city in and the county seat of Blaine County, Montana, United States. The population was 1,386 at the 2000 census. Points of interest are the Bear Paw Battlefield Museum located in the small town's center and the Bear Paw Battlefield, located just twenty miles south of Chinook.
Chinook is located at 48°35′N 109°14′W / 48.583°N 109.233°W / 48.583; -109.233 (48.5894, -109.2321).
According to the United States Census Bureau, the city has a total area of 0.5 square miles (1.3 km²), all of it land.