Oregon - Criteria: C (architecture/engineering)
| Cherry, Peter L., House |
| Chi Psi Fraternity House |
| Chitwood Bridge |
| Chown, Francis R., House |
| Christian, Daniel and Catherine, House |
| Christian-Patterson Rental Property |
| Churchill School |
| Clackamas Lake Ranger Station Historic District |
| Clark, Frank Chamberlain, House |
| Clark Historic District |
| Clark, Robert F. and Elizabeth, House |
| Clatsop County Courthouse |
| Clatsop County Jail (Old) |
| Clearwater, Jacob, House |
| Cliff Lodge |
| Cloud Cap Inn |
| Cloud Cap-Tilly Jane Recreation Area Historic District |
| Clovelly Garden Apartments |
| Clyde Hotel |
| Cobb, Samuel, House |
| Cohn-Sichel House |
| Colby, Ernest S. and Clara C., House |
| Cole, David, House |
| Coleman-Scott House |
| College Creek Ranger Station |
| College Hill West Historic District |
| Columbia Gorge Hotel |
| Columbia River Highway Historic District |
| Columbia Southern Hotel |
| Comfort Station No. 68 |
| Comfort Station No. 72 |
| Commodore Hotel |
| Concord Building |
| Congress Apartments |
| Coos Bay Bridge NO. 01823 |
| Coos Bay National Bank Building |
| Copple, Simpson, House |
| 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 |
| Corvallis Hotel |
| Costello, James C. and Mary A., House |
| Cotillion Hall |
| Cox-Williams House |
| Coyote Creek Bridge |
| Crabtree Creek-Hoffman Covered Bridge |
| Crandall, Louis A., House |
| Crater Lake Lodge |
| Crater Lake Superintendent's Residence |
| Crawfordsville Bridge |
| Crook, Charles, House |
| Crook County Bank Building |
| Crosley, Harry A., House |
| Cross, Curtis, House |
| Cross, Harvey, House |
| Crumpacker, Maurice, House |
| Crum, Virgil and Beulah, House |
| Cumberland Apartments |
| Currin Bridge |
| Curry, Nathaniel, House |
| Cyrus, Henry and Mary, Barn |
| Dads' Gates |
| Dalles Carnegie Library |
| Damascus School |
| Davidson-Childs House |
| Davis Block |
| Dawson, Alfred, House |
| Day Building |
| Dayton Apartment Building |
| Dayton High School |
| Deadwood Creek Bridge |
| Deady Hall |
| Deere, John, Plow Company Building |
| DeGuire, Murton E. and Lillian, House |
| DeHart, Edward J., House |
| Dekum, The |
| Delaney-Edwards House |
| Del Rey Apartments |
| Depoe Bay Bridge No. 01388 |
| Depoe Bay Ocean Wayside |
| Dibble, Horace L., House |
| Dickson, Henry B., House |
| Digman-Zidell House |
| Doernbecher, Frank Silas, House |
| Dooly, Frank E., House |
| Dorena Bridge |
| Doriot-Rider Log House |
| Dorris Apartments |
| Dosch, Henry E., House |
| Double-O Ranch Historic District |
| Douglas Building |
| Downing Building |
| Doyle, A. E., Cottage |
| Drain, Charles D., Jr., House |
| Drake, June D., House |
| Drake Park Neighborhood Historic District |
Data from United States Park Service and Wikidata
