Wisconsin - Criteria: C (architecture/engineering)
| Collins, John, House |
| Collins, William, House |
| Columbia Historic District |
| Columbus City Hall |
| Columbus Downtown Historic District |
| Columbus Fireman's Park Complex |
| Columbus Post Office |
| Columbus Public Library |
| Coman House |
| Commandant's Residence Home |
| Community House, First Congregational Church |
| Concordia Mill |
| Confluence Commercial Historic District |
| Congregation Beth Israel Synagogue |
| Cook-Rutledge House |
| Cook, Thomas, House |
| Coole Park Manor |
| Cooley, Eli R., House |
| Copper Falls State Park |
| Cornelius, Charles and Theresa, House |
| Cornell Pulpwood Stacker |
| Cotton House |
| Coumbe, John, Farmstead |
| Courthouse Hill Historic District |
| Courtney, J. B., Woolen Mills |
| Court Street Commercial Historic District |
| Court Street Methodist Church |
| Covered Bridge |
| Crawford County Courthouse |
| Crosby, James B., House |
| Crosse, Dr. Charles G., House |
| Cudahy Chicago and North Western Railway Depot |
| Cumberland Public Library |
| Cupola House |
| Curtin, Jeremiah, House |
| Curtis, David W. and Jane, House |
| Curtis-Kittleson House |
| Cushing Land Agency Building |
| Cutter, Judson C., House |
| 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 |
| Daily Northwestern Building |
| Damon, Lowell, House |
| Dana, George and Mary Agnes, House |
| Dansk Evangelical Lutheran Kirke |
| Darling, Frederick L., House |
| Davidson Windmill |
| Day, Isham, House |
| Delafield Fish Hatchery |
| Delavan Post Office |
| Delavan's Vitrified Brick Street |
| Dells of the Eau Claire County Park |
| De Pere Lock and Dam Historic District |
| De Pere Public Library |
| Dessert, Joseph, Library |
| Devil's Lake State Park |
| Dick, Christian, Block |
| Dickinson, Decatur and Kate, House |
| Dinesen-Motzfeldt-Hettinger Log House |
| Division Street Historic District |
| Dix Street-Warner Street Historic District |
| Dodge, Edward, House |
| Dodge Mining Camp Cabin |
| Donald, John Sweet, Farmstead |
| Douglas County Courthouse |
| Dousman Hotel |
| Dowling Apartment Building |
| Downtown Baraboo Historic District |
| Downtown Churches Historic District |
| Downtown Historic District |
| Draize, August, Farmstead |
| Drohman Cabin |
| Drummond, David, House |
| Dunbar, C. F., House |
| Dunlap, Adam, Farmstead |
| Dunlap Square Building |
| Durward's Glen |
| Dwelley, William, House |
| Eagle Bluff Lighthouse |
| Eagle River Stadium |
| Eagles Club |
| East Brady Street Historic District |
| East Division Street-Sheboygan Street Historic District |
| East End Historic District |
| East Forest Avenue Historic District |
| East Hill Residential Historic District |
| East Park Historic District |
| East Side Commercial Historic District |
| East Side Historic District |
| East Third Street Residential Historic District |
| East Wilson Street Historic District |
| Eau Claire Masonic Temple |
| Eau Claire Public Library |
| Ebert, Rudolph and Louise, House |
| Edgar Village Hall |
| Edgerton Depot |
| Edgewood Place Historic District |
Data from United States Park Service and Wikidata
