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is a town in Sanders County, Montana, United States. The population was 1,126 at the 2000 census. It was originally known as Wild Horse Plains, although the name was shortened over time.
Plains is located at (47.458504, -114.885024). The town straddles the Clark Fork River with the fairgrounds on one shore and the town proper on the other.
According to the United States Census Bureau, the town has a total area of 0.6 square miles (1.5 km²), all of it land.