The Copperopolis Armory is a Civil War armory located at 695 Main St. in Copperopolis, California. The brick Greek Revival building was constructed in 1864 to house the Union Guard of Copperopolis, the town's regiment of the Union Army. Copperopolis largely owed its existence to the war; the town grew due to a boom in local copper mining in 1860, which stemmed from the Union Army's need for copper ammunition. The armory served a variety of purposes for the Union Guard; at the building, new soldiers were enlisted, training was conducted, and arms and supplies were stored. Military balls, victory celebrations, and the local funeral ceremonies for Abraham Lincoln also took place in the armory. The armory also held an 1837 bronze cannon, which was used for ceremonial purposes and arms training