The Illinois State Capitol Building


Second & Capitol
Springfield, IL 62706

Constructed: 1867 - 1888

Square footage: 368,000


John C. Cochrane
Alfred H. Piquenard
W.W. Boyington


About the Illinois State Capitol Building

The Illinois State Capitol Building anchors the Capitol Complex on Second and Capitol streets in Springfield. The General Assembly authorized construction of the current State Capitol in 1867, which was completed over a 20-year period in 1888. It was designed by architects John C. Cochrane, Alfred H. Piquenard and W.W. Boyington and cost $4.5 million. In addition to housing Illinois' executive officers and legislators, the State Capitol originally provided quarters for the Supreme Court, government agencies, regulatory boards and military leaders. It also housed three museums, several libraries, and the State Archives. Many of those entities are now housed in separate buildings on the Capitol Complex. The State Capitol presently houses the offices of several Illinois constitutional officers, senators and representatives, and is the location of all legislative sessions of the General Assembly. The building underwent major external restoration in 1983 and 1984, and the Capitol dome was restored in 1986.