New York - Role: Building
| Consolidated Car Heating Company Complex |
| Constable Hall |
| Contempora House |
| Continental Baking Company Factory |
| Control House on 72nd Street |
| Cook, Will Marion, House |
| Coolidge Stores Building |
| Coons House |
| Cooper Avenue Row Historic District |
| Cooper Union |
| Copake Falls Methodist Episcopal Church |
| Copake Grange Hall |
| Copake Railroad Depot |
| Copake United Methodist Church and Copake Cemetery |
| Copcutt,John,Mansion |
| Copeland Carriage Shop |
| Copland, Aaron, House |
| Coppola House |
| Corbin Building |
| Corby Farm Complex |
| Cordts Mansion |
| Corey Cottage |
| Corlies-Ritter-Hart House |
| Cornell Farmhouse |
| Cornell-Van Nostrand House |
| Cornfield, The |
| Corning Armory |
| Cornwall Brothers' Store |
| Cornwall Friends Meeting House |
| Corpus Christi R.C. Church Complex |
| Cortland County Courthouse |
| Cortland County Poor Farm |
| Cortland Fire Headquarters |
| Cortland Free Library |
| Corwith, William, House |
| Cottage Farm |
| Cottage Lawn |
| Cottages at Central Point |
| Coulter Cottage |
| County and City Hall |
| County Farm |
| Courier Building, The |
| Court Exchange Building-National Casket Company |
| Coverdale Cobblestone House |
| Covert, William, Cobblestone Farmhouse |
| Covewood Lodge |
| Cowles, W.T., House |
| Cox-Budlong House |
| Cox Building |
| Cox Farmhouse |
| Cox, Gardner, House |
| Cox, Isaac, Cobblestone Farmstead |
| Cox, Richard, House |
| Coykendall Lodge |
| Crabtree, John A., House |
| Cragston Dependencies |
| Cramer, Frederick, House |
| Crandall Farm Complex |
| Crandell Theatre |
| Crane House |
| Craver Farmstead |
| Crawford, David, House |
| Crawford, John I, Farm |
| Creek Meeting House and Friends' Cemetery |
| Crego, Mrs.. I.L., House |
| Crescent Corset Company |
| Crescent Methodist Episcopal Church |
| Crest, The |
| Crest, The |
| Croghan Island Mill |
| Cromwell Manor |
| Cronkite, Jeremiah, House |
| Cronyn, William B., House |
| Cropsey, Jasper F., House and Studio |
| Crotona Play Center |
| Croton Aqueduct Gate House |
| Croton North Railroad Station |
| Crouse College, Syracuse University |
| Crouse, Frederick, House |
| Crouse, Jacob, Inn |
| Crouse, John and Henry, Farm Complex |
| Crowell House |
| Crowell, J. B., and Son Brick Mould Mill Complex |
| Crow Hill |
| Crowther House |
| Crum Elbow Meeting House and Cemetery |
| Cumming-Parker House |
| Cunningham House |
| Cure Cottage at 43 Forest Hill Avenue |
| Curtis-Crumb Farm |
| Curtiss, Harlow C., Building |
| Curtis, Thomas Bennett, House |
| Customs House |
| Cuyler Presbyterian Church |
| Dahlgren, Lucy Drexel, House |
| Daily News Building |
| Daisy Flour Mill, Inc. |
| Dakin-Coleman Farm |
| Dakota Apartments |
| Danascara Place |
Data from United States Park Service and Wikidata
