All - Constructed - 1870–1879
| Castle Rock Depot |
| Cataract Covered Bridge |
| Cathedral of St. Paul |
| Cavanaugh-Zetek House |
| Cedar Grove Cemetery |
| Cedar Point Mill |
| Cementerio Municipal de Mayaguez |
| Central City Park Bandstand |
| Central Ohio Lunatic Asylum |
| Central Synagogue |
| Ceres Bethel AME Church |
| Chace, A. B., Rowhouses |
| Chace Mills |
| Chamberlain-Hunt Academy Historic District |
| Chapel of the Good Shepherd |
| Chapman, A. F., House |
| Chariton Free Public Library |
| Charlotte Pound |
| Charlton, William H., House |
| Charter Oak Firehouse |
| Charter Oak Schoolhouse |
| Chase County Courthouse |
| Chautauqua Institution Historic District |
| Chestnut Grove |
| Chicago, Milwaukee and St. Paul Railway Passenger Depot |
| Chief Lippert Fire Station |
| Chizuk Amuno Synagogue |
| Christ Episcopal Church |
| Church Dulce Nombre de Jesus of Humacao |
| Church of Our Savior |
| Church of St. Andrew (Episcopal) |
| Church of St. Mary Help of Christians-Catholic |
| Church of the Ascension |
| Church of the Ascension |
| Church of the Assumption-Catholic |
| Church of the Atonement |
| Church of the Holy Family |
| Church of the Holy Trinity |
| Church of the Visitation of the Blessed Virgin Mary |
| Cimarron Redoubt |
| Citizens Hall |
| City Hall |
| Civil War Memorial |
| Clark, Alexander, House |
| Clark House |
| Clay County Courthouse |
| Clearwater, Jacob, House |
| Cleveland's Hall and Blacksmith Shop |
| Clio Depot |
| Clover Lawn |
| Codman Building |
| Coffee County Courthouse |
| Cogan House Covered Bridge |
| Colburn, Gilbert, House |
| Collier-Crichlow House |
| Collings, James, Jr., House |
| Columbia City Hall |
| Colville Covered Bridge |
| Colwell, David B., House |
| Commandant's Residence, Quarters Number One, Fort Adams |
| Como Park Conservatory |
| Comstock's Bridge |
| Con Creek School |
| Confederate Monument |
| Confederate Monument at Crab Orchard |
| Confederate Monument in Versailles |
| Confederate Soldiers Martyrs Monument in Eminence |
| Congdon Street Baptist Church |
| Cook, Asa M., House |
| Cook-Rutledge House |
| Cooksville Cheese Factory |
| Cook, Thomas, House |
| Cook, William, House |
| Coonrad, Jonas, House |
| Cooper, Judge John E., House |
| Coralville Public School |
| Corbett Farm |
| Corlies-Ritter-Hart House |
| Cornelius, Benjamin, Jr., House |
| Coshocton County Courthouse |
| Cottage at Rock and Dubuque Streets |
| County Line Bowstring |
| Covered Bridge |
| Cowdell, Enoch E., House |
| Cowles, George H and Alice Spaulding, House |
| Cox, Andrew M., Ranch Site |
| Cox, John, House |
| Craigmiles Hall |
| Crawford, Col., Burn Site Monument |
| Creamery Covered Bridge |
| Creek National Capitol |
| Croll Building |
| Cross Roads Presbyterian Church and Cemetery and Stainback Store |
| Cumberland Covered Bridge |
| Cumberland Valley State Normal School Historic District |
| Cummins School |
| Cupola House |
| Currituck Beach Lighthouse |
| Cutler-Donahue Covered Bridge |
| Damascus School |
Data from United States Park Service and Wikidata
