Wisconsin - Significance region: Local
| Cleveland's Hall and Blacksmith Shop |
| Clinton Village Hall |
| Clintonville Federal Savings and Loan Association |
| Clintonville High School |
| Clintonville Post Office |
| Clinton Water Tower |
| Club Harbor |
| Clyman Street Historic District |
| Coakley Brothers Warehouse |
| Coates, Leonard and Caroline, House |
| Cobb, George N., House |
| Cold, Jens and Ingeborg, House |
| Cole Historic District |
| Cole, William I, House |
| Colfax Municipal Building |
| College Avenue Historic District |
| College Avenue Historic District |
| College Hills Historic District |
| Collins, William, House |
| Columbia Historic District |
| Columbia Park Band Shell |
| Columbus Circle Historic District |
| Columbus City Hall |
| Columbus Downtown Historic District |
| Columbus Fireman's Park Complex |
| Columbus Post Office |
| Coman House |
| Commerce Street Power Plant |
| Commercial Hotel |
| Concordia Historic District |
| Confluence Commercial Historic District |
| Connor Lumber and Land Company Store |
| Conrad Cottages Historic District |
| Cook, Alexander, House |
| Cook-Rutledge House |
| Cooksville Cheese Factory |
| Cooksville Historic District |
| Cooksville Mill and Mill Pond Site |
| Cook, Thomas, House |
| Coole Park Manor |
| Cooley, Eli R., House |
| Coolidge Street-Myrtle Street Historic District |
| Cooper-Gillies House |
| Copeland-Ryder Company |
| Copper Falls State Park |
| Cords, Erwin, House |
| Cornelius, Charles and Theresa, House |
| Corwith, J. W., Livery |
| Cotton House |
| Coumbe, John, Farmstead |
| Courier Building |
| Courthouse Hill Historic District |
| Courthouse Square Historic District |
| Courtney, J. B., Woolen Mills |
| Court Street Commercial Historic District |
| Court Street Methodist Church |
| Cox, Angie Williams, Library |
| Crawford County Courthouse |
| Crist, J. W., House |
| Crosby Block |
| Crosby, James B., House |
| Crosse, Dr. Charles G., House |
| Crow Hollow Site |
| Cudahy Chicago and North Western Railway Depot |
| Culton, Charles L., House |
| Cumberland Public Library |
| Cunningham, Bert and Mary, Round Barn |
| Cunningham Lane Bridge |
| Cupola House |
| Curtin, Jeremiah, House |
| Curtis, David W. and Jane, House |
| Curtis-Kittleson House |
| Cushing Land Agency Building |
| Cutler, Morris, House |
| Cutler Mound Group |
| Dahinden, Edward J., House |
| Dahle, Henry L. and Sarah, House |
| Dahle, Herman B. and Anne Marie, House |
| Dahle, Onon B. and Betsy, House |
| Dahl, Martin K., House |
| Daly, Elizabeth, House |
| Damon, Lowell, House |
| Dana, George and Mary Agnes, House |
| Danes Hall |
| Daniels Town Hall |
| Dansk Evangelical Lutheran Kirke |
| Darling, Frederick L., House |
| Darlington Carnegie Free Library |
| Daubner, George H. and Frances, House |
| Davies, Edward and Mary, House |
| Davis, Cyrus-Davis Brothers Farmhouse |
| Davis, Cyrus, Farmstead |
| Davis, H. R., House |
| Daviswood Ranch Homes Historic District |
| Day, Isham, House |
| Dean, Erastus, Farmstead |
| Dean, Nathaniel W., House |
| Delafield Fish Hatchery |
| Delavan Downtown Commercial Historic District |
| Delavan Post Office |
Data from United States Park Service and Wikidata
