Buck Mountain is a summit in southern St. Francois County in the U.S. state of Missouri. Buck Mountain has an elevation of . The mountain lies east of Missouri Route V about six miles northeast of Pilot Knob and about six miles southwest of Doe Run.Missouri Atlas & Gazetteer, DeLorme, 1998, First edition, pp. 56-7
Buck Mountain was so named on account of deer in the area.
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