All - Constructed - 1850–1859
| Christ Church |
| Christ Church (Episcopal) and Churchyard |
| Christ Episcopal Church |
| Christ Episcopal Church and Cemetery |
| Church of St. Barnabas |
| Church of the Advent |
| Church of the Assumption |
| Church of the Cross |
| Church of the Holy Innocents |
| Church of the Holy Trinity |
| Church of the Holy Trinity |
| Church of the Immaculate Conception and the Michael Ferrall Family Cemetery |
| City Hall |
| Clark Historic District |
| Clark, John, House |
| Cliff Cottage |
| Cliffs Plantation |
| Clifton House and Mill Site |
| Clifton Plantation House |
| CLOTILDA (schooner) |
| Clough, Benjamin F., House |
| Cocke-Martin-Jackson House |
| Cockey-Jamison-Hendrickson House and Store |
| Colbert's Ferry Site |
| Coldwater Creek Covered Bridge |
| Cole, William I, House |
| Collins, John, House |
| Community Building |
| Concklin, Abner, House |
| Concord Congregational Cemetery |
| Concordia Mill |
| Connecticut State Library and Supreme Court Building |
| Conner House |
| Constitution Hall |
| Constitution Hall-Topeka |
| Cook-Sellers House |
| Cook, Thomas, House |
| Cooley, Eli R., House |
| Cooper Union |
| Cornsilk |
| Cottage on King's Row |
| Cotting, John, House |
| Cox-Shoemaker-Parry House |
| Cox-Uithoven House |
| Cragin, Daniel, Mill |
| Creekwood |
| Cresent City Lighthouse |
| Cretsinger, John, House |
| Cronyn, William B., House |
| Crooker, W. D., House |
| Crooks Bridge |
| Crosby, James B., House |
| Currituck County Courthouse and Jail |
| Curry Hill Plantation |
| Cutter, Second, A. P., House |
| Dale Cemetery |
| Damon House |
| Daniels, Blake, Cottage |
| Darling, Frederick L., House |
| Daughters' College |
| Davis-Felton Plantation |
| Day, Anna, House |
| Dayton, Daniel, House |
| Dayton's Corners School |
| Deason, Amos, House |
| DeBow, James R., House |
| Decatur County Courthouse |
| Decker's Chapel |
| Deer Park Hotel |
| DeFries House, Barn and Carpenter Shop |
| De Garcia, Tomasa Griego, House |
| DeLand, Minerva and Daniel, House |
| Delaney Hotel |
| Dennis-Coxetter House |
| Detroit Observatory |
| Dewey Place |
| Dezengremel, Remy, House |
| D & H Canal Co. Office |
| Dickson Works |
| Dietrich Cabin |
| Dike-Orne House |
| District No. 2 Schoolhouse |
| District No. 34 School |
| Dixboro United Methodist Church |
| Dominy, John S., House |
| Downtown Baptist Church |
| Drake, Benjamin and Maria (Ogden), Farm |
| Drake, Elam, House |
| Dresden Town House |
| Drohman Cabin |
| Dubs, Dr. Charles H., Townhouse |
| Dulcito Plantation House |
| Dunk, Alfred, House |
| Dunleith |
| Dupree-Ratliff House |
| Dyas, George, House |
| Eagle Harbor Light Station |
| East Otis Schoolhouse |
| East Stroudsburg Railroad Station |
| Eden |
Data from United States Park Service and Wikidata
