Oregon - Area of significance: Architecture
| Burrell, Walter F., House |
| Bursell, Victor and Bertha, House |
| Bush and Brey Block and Annex |
| Bush, Asahel, House |
| Bush-Breyman Block |
| Butler Bank |
| Butte Falls Ranger Station |
| Buyers Building |
| Bybee, Frank E., House |
| Bybee-Howell House |
| Bybee, William, House |
| Byberg, Peter, House |
| Cabin Lake Guard Station |
| Cahill-Nordstrom Farm |
| Cain House |
| Calhoun, George, House |
| Calkins, Windsor W., House |
| Calumet Hotel |
| Calvary Lutheran Church & Parsonage |
| Calvary Presbyterian Church |
| Cameo Theatre |
| Campbell Court Hotel |
| Campbell, David, Memorial |
| Campbell, Hamilton, House |
| Campbell Hotel |
| Campbell, Richard Posey, House |
| Campbell, Robert E., House |
| Campbell Townhouses |
| Camp Namanu |
| Camp Sherman Community Hall |
| Canemah Historic District |
| Cant, James, Ranch Historic District |
| Canyonville Methodist Church |
| Cape Arago Lighthouse |
| Cape Blanco Lighthouse |
| Cape Meares Lighthouse |
| Cape Perpetua Shelter and Parapet |
| Cardwell-Holman House |
| Cardwell-Parrish House |
| Carpenter, A.S.V., and Helen Bundy House |
| Carter, E. V., House |
| Carter-Fortmiller House |
| Carter-Goodrich House |
| Carter, H. B., House |
| Cary, Leo J., House |
| Cascade Locks Marine Park |
| Cascade Locks Work Center |
| Case, William, Farm |
| Cate, Asa F., Farm Ensemble |
| Caton, Jesse H., House |
| Cedar Guard Station No. 1019 |
| Central Building |
| Central Building, Public Library |
| Central Point Public School |
| Chamberlain, George Earle, House |
| Chambers, Frank L. and Ida H., House |
| Chambers, Fred E. House and Grounds |
| Chambers, Joseph and Virginia, Farmstead |
| Chambers, Matthew C., Barn |
| Chandler Hotel and Annex |
| Chappell-Swedenburg House |
| Chase Gardens Residential Grouping |
| Chavner Family House |
| Chemeketa Lodge No. 1 Odd Fellows Buildings |
| Cherry, Peter L., House |
| Chi Psi Fraternity House |
| Chown, Francis R., House |
| Christian, Daniel and Catherine, House |
| Christian-Patterson Rental Property |
| Churchill School |
| Citizen's Banking & Trust Co. Building |
| Clackamas Lake Ranger Station Historic District |
| Clark, Elizabeth, House |
| Clarke, William J. and Lodema, House |
| Clark, Frank Chamberlain, House |
| Clark Historic District |
| Clark-McConnell House |
| Clark-Norton House |
| Clark, Robert F. and Elizabeth, House |
| Clatsop County Courthouse |
| Clatsop County Jail (Old) |
| Clearwater, Jacob, House |
| Clemens, Michael, House |
| Cliff Lodge |
| Cloud Cap Inn |
| Cloud Cap-Tilly Jane Recreation Area Historic District |
| Clovelly Garden Apartments |
| Clyde Hotel |
| Cobb, Samuel, House |
| Cobbs, Frank J. and Maude Louise, Estate |
| Cochran, William, Barn |
| 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 |
| Collins, George, House |
| Columbia College |
| Columbia Gorge Hotel |
Data from United States Park Service and Wikidata
