Oregon - Role: Building
| Clyde Hotel |
| Cobb, Samuel, House |
| Cobbs, Frank J. and Maude Louise, Estate |
| Cochran-Rice Farm Complex |
| Cochran, William, Barn |
| Cohn-Sichel House |
| Coke, J. S., Building |
| Colby, Ernest S. and Clara C., House |
| Cole, David, House |
| Coleman-Scott House |
| Collins, George, House |
| Columbia College |
| Columbia Gorge Hotel |
| Columbia Southern Hotel |
| Columbia Southern Railroad Passenger Station and Freight Warehouse |
| Comfort Station No. 68 |
| Comfort Station No. 72 |
| Commercial Club-Stuckey, S. C., Building |
| Commodore Hotel |
| Concord Building |
| Congress Apartments |
| Conser, Jacob, House |
| Cook, Amos, House |
| Cook, Jacob H. and Etna M., House |
| Cooley, George C., House |
| Cooley-Neff Warehouse |
| Coolidge, Orlando, House |
| Cooper, James S. and Jennie M., House |
| Coos Bay Carnegie Library |
| Coos Bay National Bank Building |
| Copple, Simpson, House |
| Coquille City Hall |
| Coquille River Life Boat Station |
| Coquille River Light |
| Corbett Brothers Auto Storage Garage |
| Corbett, Elliott R., House |
| Corbett, H. L. and Gretchen Hoyt, House |
| Corkish Apartments |
| Cornelius, Benjamin, Jr., House |
| Cornelius Hotel |
| Cornell, Albert B. and Mary, House |
| Corning Court Ensemble |
| Cornucopia Jailhouse |
| Corvallis Hotel |
| Costanzo Family House |
| Costello, James C. and Mary A., House |
| Cotillion Hall |
| Cottage Grove Armory |
| Couch Family Investment Development |
| Cox-Williams House |
| Crandall, Louis A., House |
| Crater Lake Lodge |
| Crater Lake Superintendent's Residence |
| Craven, Joseph and Priscilla, House |
| Creswell Public Library and Civic Improvement Club Clubhouse |
| Crook, Charles, House |
| Crook County Bank Building |
| Crosley, Harry A., House |
| Cross, Curtis, House |
| Cross, Harvey, House |
| Croxton, Thomas, House |
| Crumpacker, Maurice, House |
| Crum, Virgil and Beulah, House |
| Cumberland Apartments |
| Cumberland Presbyterian Church |
| Cunha, Joseph, Farmstead |
| Curry, Nathaniel, House |
| Cusick, Dr. William A., House |
| Cyrus, Henry and Mary, Barn |
| Dallas Cinema |
| Dallas Tannery |
| Dalles Carnegie Library |
| Damascus School |
| Dana, Marshall, House |
| Darcelle XV |
| Daue, Alexander, House |
| Davidson-Childs House |
| Davidson, Dr. John E. and Mary D., House |
| Davis Block |
| Dawson, Alfred, House |
| Day Building |
| Dayton Apartment Building |
| Dayton Common School |
| Dayton High School |
| Dayton Methodist Episcopal Church |
| Deady Hall |
| Dean’s Beauty Salon and Barber Shop |
| Deedon, Ed and Genevieve, Homestead |
| Deere, John, Plow Company Building |
| DeGuire-Ludowitzki House |
| DeGuire, Murton E. and Lillian, House |
| DeHart, Edward J., House |
| Deidrich Building |
| Dekum, The |
| Delaney-Edwards House |
| Del Rey Apartments |
| Depoe Bay Ocean Wayside |
| Deschutes County Library |
| Dibble, Horace L., House |
| Dickson, Henry B., House |
Data from United States Park Service and Wikidata
