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is a borough in Huntingdon County, Pennsylvania, 45 miles (72 km) southeast of Altoona, on the Juniata River. In the vicinity are found bituminous coal, ganister rock, fire clay, and some timber. A major Easter grass factory is located in the northern quadrant of the borough limits; until May 2007, the facility was owned by Bleyer Industries.
The industries of the past were (circa 1900 to circa 1972) three silica brickworks, making it the world's largest community for the manufacture of refractory material, two tanneries, an extract plant, coal yards, and foundry and machine shops. Mount Union was the northern terminus for the East Broad Top Railroad, connecting to the Main Line of the Middle Division of the Pennsylvania Railroad. Mount Union has a designated National Register Historic District with 300 significant historic structures, buildings, and homes. The population tally in 1900 was 1,086 which rose to 3,338 in 1910.