Copperopolis Armory, built by public subscription in 1866 for 8,000 dollars, was used by the Union Guard for enlisting and training troops. In 1868 it was sold to the Copperopolis Armory Hall Association for 800 dollars in gold and was used for Congregational and Methodist Church services, public meetings, balls and rallies.

The property was purchased by the Mineral Lodge, I.O.O.F. in 1874 and used as a lodge until 1903. Copperopolis Community Center purchased the armory in 1948.

Placed on the National Register of Historic Places December 30, 1997
Dedicated through the efforts of Charles and Rhoda Stone
Presented By N.D.G.W., Princess Parlor No. 84