All - Architectural style - Romanesque Revival architecture
| Capt. Stone House |
| Carbondale City Hall and Courthouse |
| Carey, Philip, Building |
| Carnegie Free Library |
| Carnegie Free Library of Allegheny |
| Carnegie Free Library Of Braddock |
| Carnegie Library of Steubenville |
| Carnegie Public Library |
| Carroll Building |
| Carroll County Court House |
| Carson City Civic Auditorium |
| Casey, Patrick, House |
| Cass Avenue Methodist Episcopal Church |
| Caswell Public Library (Former) |
| Cathedral of Saints Peter and Paul |
| Cathedral of the Immaculate Conception |
| Cathedral of the Madeleine |
| Cedar County Courthouse |
| Cedar Cove |
| Cedarville Opera House |
| Centennial Malt House |
| Central Christian Church |
| Central Congregational Church |
| Central Market |
| Central Roanoke Historic District |
| Central United Methodist Church |
| Chapple and Young Block |
| Charles City College Hall |
| Charles Town Mining, Manufacturing, and Improvement Company Building |
| Charter Oak Firehouse |
| Chatahoochee County Jail |
| Chemeketa Lodge No. 1 Odd Fellows Buildings |
| Cherry County Courthouse |
| Chester City Hall and Opera House |
| Chester Terrace |
| Chicago and Norhwestern Railroad Depot |
| Chicago and Northwestern Railroad Depot |
| Chicago and Northwestern Railroad Depot |
| Chicago Club |
| Chicago & Northwestern Passenger Depot and Baggage Room-Carroll |
| Chicago, Rock Island and Pacific Railroad Passenger Station |
| Chicago, Rock Island and Pacific Railroad-Wilton Depot |
| Chicago, Rock Island & Pacific Railroad Passenger Depot |
| Chilocco Indian Agricultural School |
| Choate Deparment Store |
| Christ Episcopal Church |
| Christ Evangelical English Lutheran Church |
| Christian Church |
| Chrystal Water and Power Company-Spencer Water and Ice Company |
| Church of Saint Anthony |
| Church of St. Adrian-Catholic |
| Church of St. Andrew (Episcopal) |
| Church of St. Boniface |
| Church of St. Joseph |
| Church of St. Stephen-Catholic |
| Church of the Assumption |
| Church of the Assumption-Catholic |
| Church of the Holy Trinity |
| Church of the Holy Trinity |
| Church of the Immaculate Conception |
| Church of the Immaculate Conception-Catholic |
| Church of the Most Holy Trinity |
| Church of the Redeemer |
| Church of the Saviour Episcopal Church and David Henderson Statue |
| Church of the Visitation of the Blessed Virgin Mary |
| Cincinnati, Richmond, & Muncie Depot |
| City Hall |
| City Hall |
| City Hall Subway Station (IRT) |
| City Market |
| City National Bank Building |
| City Park Brewery |
| Claremont Stables |
| Clarion County Courthouse and Jail |
| Clark County Jail |
| Clarke County Courthouse (Old) |
| Clarkson Office Building |
| Clayborn Temple |
| Clay County Courthouse |
| Cleveland Grays Armory |
| Cleveland Law Range |
| Clinton High School and Public Library |
| Clinton-Rosekrans Law Building |
| Cloud, Chalon Guard and Emma Blades, House |
| Coffee County Courthouse |
| Cohen, H. C., Company Building-Andrews Building |
| Colby Hall |
| Cole County Courthouse and Jail-Sheriff's House |
| Columbian School |
| Columbus City Hall |
| Comal County Courthouse |
| Commercial Trust Company Building |
| Conant Public Library |
| Confederate Memorial Hall |
| Congregation Adath Jeshurun |
| Congregation Agudath Shalom |
| Congregational Church of Faribault |
| Congregational Church of Patchogue |
| Congregation Sharey Tzedek Synagogue |
| Congregation Tifereth Israel |
Data from United States Park Service and Wikidata
