Wisconsin - Area of significance: Architecture
| Caradine Building |
| Cardinal Hotel |
| Carnegie Free Library |
| Carpenter, Michael, House |
| Cass and King Street Residential Historic District |
| Cassidy Farmhouse |
| Cass-Juneau Street Historic District |
| Cass-Wells Street Historic District |
| Castleman, Dr. Alfred L., House |
| Cedarburg Mill |
| Center Avenue Historic District |
| Center Valley Grade School |
| Central House Hotel |
| Central Library |
| Central Park Historic District |
| Central Wisconsin State Fair Round Barn |
| Century Building |
| Chadbourn, F. A., House |
| Chalet of the Golden Fleece |
| Chamberlin, Clarence, House |
| Chambers-Markle Farmstead |
| Chambers, Pearl and Eva, House |
| Chandler, Walter S., House |
| Chapel of St. Mary the Virgin |
| Chapple and MacArthur Avenues Residential Historic District |
| Chase, Dr. H. H., and Henry G. Wohlhuter Bungalows |
| Chase Grain Elevator |
| Chenoweth, Frank L., House |
| Chicago and Norhwestern Railroad Depot |
| Chicago and North Western Depot |
| Chicago and Northwestern Railroad Depot |
| Chicago and Northwestern Railroad Passenger Depot |
| Chicago and North Western Railway Passenger Depot |
| Chicago and Northwest Railroad Passenger Station |
| Chicago, Milwaukee and Saint Paul Railroad Depot |
| Chicago, Milwaukee and St. Paul Railway Company Passenger Depot |
| Chicago, St. Paul, Minneapolis and Omaha Railroad Car Shop Historic District |
| Chicago, St. Paul, Minneapolis and Omaha Railroad Passsenger Station |
| Chicago, St. Paul, Minneapolis & Omaha Railroad Depot |
| Chief Lippert Fire Station |
| Christ Church Cathedral and Parish House |
| Christ Church of LaCrosse |
| Christ Episcopal Church |
| Christ Episcopal Church Complex |
| Christ Evangelical Church |
| Christ Evangelical Lutheran Church |
| Christ Evangelical Lutheran Church of Burr Oak |
| Church, Benjamin, House |
| Church Hill Historic District |
| Church of St. Thomas the Apostle |
| Church of the Atonement |
| Church Street Historic District |
| Citizens Bank |
| City Hall |
| City Hotel |
| City Market |
| City of Waterloo Carousel |
| Civic Center Historic District |
| Clark-Brown House |
| Clark County Jail |
| Clarke, George Lawrence Jr., House |
| Clark, Jonathan, House |
| Clark Street-Main Street Historic District |
| Clark, William, House |
| Clinton Village Hall |
| Clintonville Federal Savings and Loan Association |
| Clintonville Post Office |
| Clyman Street Historic District |
| Coakley Brothers Warehouse |
| Coates, Leonard and Caroline, House |
| Cobb, George N., House |
| Cobblestone House |
| Cold, Jens and Ingeborg, House |
| Cole, William I, House |
| College Avenue Historic District |
| College Avenue Historic District |
| College Hills Historic District |
| Collins, John, House |
| Collins, William, House |
| Columbia Historic District |
| Columbus Circle Historic District |
| Columbus City Hall |
| Columbus Downtown Historic District |
| Columbus Fireman's Park Complex |
| Columbus Public Library |
| Coman House |
| Commandant's Residence Home |
| Community House, First Congregational Church |
| Concordia Historic District |
| Concordia Mill |
| Confluence Commercial Historic District |
| Congregation Beth Israel Synagogue |
| Conrad Cottages Historic District |
| Cook-Rutledge House |
| Cooksville Historic District |
| Cook, Thomas, House |
| Coole Park Manor |
| Cooley, Eli R., House |
| Cooper-Gillies House |
| Copper Falls State Park |
Data from United States Park Service and Wikidata
