California - Significance region: Local
| Casa de Esperanza |
| Casa de Parley Johnson |
| Casa de Rosas |
| Casa Romantica |
| Cascade Theatre |
| Case Study House No. 1 |
| Case Study House No. 10 |
| Case Study House No. 16 |
| Case Study House No. 18 |
| Case Study House No. 20 |
| Case Study House No. 21 |
| Case Study House No. 22 |
| Case Study House No. 23C |
| Case Study House No. 28 |
| Case Study House No. 9 |
| Castle, The |
| Castro, Jose Joaquin, Adobe |
| Castroville Japanese Language School |
| Cattle Cabin |
| Cecil Ranch |
| Cedar Avenue Complex |
| Centerville Schoolhouse |
| Centinela Adobe |
| Centrella Hotel |
| Chalone Creek Archeological Sites |
| Chamber of Commerce Building |
| Chambord Apartments |
| Chapel of the Transfiguration |
| Chaplain's House |
| Chapman, A. H., House |
| Chapman Building |
| Chapman, John G., House |
| Charmont Apartments |
| Chateau Colline |
| Chateau Pacheteau |
| Chicano Moratorium March December 20, 1969 |
| Chichizola Family Store Complex |
| Ch'ichu'yam-bam |
| Childs, William, House |
| Chinatown Gardens Archaeological District |
| Chinese Shrimp Camp |
| Choy, Sam, Brick Store |
| Christ College Site |
| Christian Church of Gilroy |
| Christian Science Society |
| Christmas Tree Lane |
| Chung Wah Cemetery |
| Churchill Manor |
| Church of St. Joseph |
| Church of the Epiphany |
| Church of the Good Shepherd-Episcopal |
| Church of the Nativity |
| Citizens Publishing Company Building |
| Citrus Square Historic District |
| City Hall |
| City Hall |
| City Hall-City of Burbank |
| City Hotel |
| City of San Diego Police Headquarters, Jails and Courts |
| City Transfer and Storage Company Warehouse |
| Civic Center Financial District |
| Clark, Dr. George C., House |
| Clark, Mary Andrews, Memorial Home |
| Clark, William S., House |
| Clay Building |
| Clayton Vineyards-DeMartini Winery |
| Cloverdale Railroad Station |
| Cloyne Court Hotel |
| Club Casa Del Mar |
| Cnopius House |
| Coachella Valley Fish Traps |
| Coachella Valley Savings No. 1 |
| Coachella Valley Savings No. 2 |
| Coalinga Polk Street School |
| Coffin-Redington Building |
| Cohen, Alfred H., House |
| Cohn House |
| Colfax Freight Depot |
| Colfax Passenger Depot |
| College Women's Club |
| Colombo Building |
| Colonial Court |
| Colonial House |
| Colony House |
| Colusa Carnegie Library |
| Colusa Grammar School |
| Colusa High School and Grounds |
| Combellack-Blair House |
| Commercial and Savings Bank |
| Commercial Club |
| Commercial Exchange Building |
| Commercial Row-Brickelltown Historic District |
| Community Church of Gonzales |
| Community Clubhouse |
| Community Settlement House |
| Comstock House |
| Con Creek School |
| Cone and Kimball Building |
| Confidence Hall |
| Congdon, Joel R., House |
Data from United States Park Service and Wikidata
