Square Butte is an unincorporated community and Census-designated place in Chouteau County, Montana, United States, named for the unique rock formation of the same name slightly southwest of the town. Square Butte is located along Montana Highway 80, 6.8 miles (10.9 km) south-southeast of Geraldine.
The Square Butte Jail, Square Butte School, and West Quincy Granite Quarry, all of which are listed on the National Register of Historic Places, are located in Square Butte.
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