All - Architectural style - Neoclassical architecture
| Chesapeake and Potomac Telephone Company, Cleveland-Emerson Exchange |
| Chesnut Cottage |
| Chester County Courthouse |
| Chevy Chase Arcade |
| Chevy Chase Theater |
| Chewning House |
| Cheyenne County Courthouse |
| Chicago and North Western Depot |
| Chicago Apartments |
| Chicago, Burlington & Quincy Railroad Depot |
| Chicago Public Library, Central Building |
| Chicago Telephone Company Kedzie Exchange |
| Children's Dispensary |
| Chi Omega Chapter House |
| Chippiannock Cemetery |
| Chorn, Lester H. and Mabel Bryant, House |
| Choy, Sam, Brick Store |
| Christian Church Hospital |
| Christian, Daniel and Catherine, House |
| Christie, Dr. George R., House |
| Churchill County Courthouse |
| Churchill County Jail |
| Church, Volney-Carlos B. Shotwell House |
| Cimarron County Courthouse |
| Circle Theater |
| Citizens National Bank |
| Citizens National Bank Building |
| Citizens State Bank of Gillett |
| Citrus County Courthouse, Old |
| City and County Building |
| City Hall |
| City Hall |
| City Hall |
| City Hall and Opera House |
| City Hall Annex |
| City Hall/Thalian Hall |
| City National Bank |
| City National Bank |
| City National Bank Building |
| City Savings Bank & Trust Company |
| Clallam County Courthouse |
| Clarendon Methodist-Episcopal Church South |
| Clarendon School |
| Clarendon Stone Store |
| Clarinda Carnegie Library |
| Clark Hall, University of Virginia |
| Clay Center Carnegie Library |
| Clay County Courthouse |
| Clay County Courthouse |
| Clay County Courthouse |
| Clay, Henry, School |
| Cleburne Carnegie Library |
| Cleburne County Courthouse |
| Clemens Automobile Company Building |
| Clemmer Theater |
| Clendenin Historic District |
| Clermont Public School |
| Cleveland County Courthouse |
| Cleveland Discount Building |
| Cleveland School |
| Clewiston Inn |
| Clifford House |
| Clinton Apartments |
| Clinton-Rosekrans Law Building |
| Cluff Apartments |
| Coalmont Bank Building |
| Codington County Courthouse |
| Codman-Davis House |
| Coffeyville Carnegie Public Library Building |
| Col Alto |
| Colchester Apartments |
| Cold Spring Harbor Library |
| Colegio de las Madres del Sagrado Corazon |
| Colfax Carnegie Library |
| College View Public Library |
| Collins House |
| Collinsville Masonic Temple Lodge #712 A.F. & A.M. |
| Colombo Building |
| Colonial and Euclid Arcades |
| Colonial Beacon Gas Station |
| Colonial Estate |
| Colonial Hill Historic District |
| Colonial National Bank Building |
| Colonnade Apartment Building at 4302 Oak Street |
| Colorado County Courthouse |
| Colorado National Bank Building |
| Colorado Springs City Auditorium |
| Colorado Springs City Hall |
| Colorado Springs Public Library-Carnegie Building |
| Colored Memorial School and Risley High School |
| Colquitt County Courthouse |
| Columbus County Courthouse |
| Columbus Public Carnegie Library |
| Colusa Carnegie Library |
| Comache County Courthouse |
| Comal Power Plant |
| Combs, H. B., House |
| Comeau Building |
| Commodore Hull School |
| Community Building |
Data from United States Park Service and Wikidata
