All - Constructed - 1920–1929
| Century Building and Little Theatre |
| Chadwick House |
| Chamber of Commerce Building |
| Chamber of Commerce Building |
| Chambers Bridge |
| Chambers, Pearl and Eva, House |
| Champion and Pearson Funeral Home |
| Chandler House |
| Chapelle Administration Building |
| Chapel of St. Theresa-the Little Flower |
| Chapel of the Transfiguration |
| Charlotte Fire Station No. 4 |
| Charlotte High School |
| Charmont Apartments |
| Chase Grain Elevator |
| Chateau Crillon Apartment House |
| Chateau Dodge Theatre |
| Checker Cab Taxi Garage and Office Building |
| Cherry, Peter L., House |
| Chesapeake and Potomac Telephone Company Building |
| Chevrolet Motor Company Building |
| Chevy Chase Arcade |
| Cheyenne County Courthouse |
| Chicago Beach Hotel |
| Chicago, Milwaukee and Saint Paul Railway Passenger Depot |
| Chief Theater |
| Chrislip, H. C., House |
| Christine Falls Bridge |
| Church in the Glen, The |
| Church of the Assumption and Rectory |
| Citizens Bank Building |
| City Garage Yard and Fire Drill Tower |
| City of Beloit Waterworks and Pump Station |
| City Ramp Garage |
| City Stable and Garage |
| Clark, George Rogers, Sculpture |
| Clark, John Hector, House |
| Cloquet City Hall |
| Clovelly Garden Apartments |
| Clune Building |
| Coca-Cola Baltimore Branch Factory |
| Coca-Cola Bottling Company Plant |
| Cocoa Junior High School |
| Coffee Pot, The |
| College Club Inn |
| College View Historic District |
| Colonial Beacon Gas Station |
| Colonnade Court |
| Colorado Building |
| Colorado Springs Airport |
| Columbia County High School |
| Columbia Gorge Hotel |
| Columbian Mutual Tower |
| Columbus Fireman's Park Complex |
| Colvos Store |
| Comache County Courthouse |
| Comal Power Plant |
| Comeau, Alfred J., House |
| Commercial Trust Company Building |
| Commodore Apartment Building |
| Community Hospital |
| Community Memorial Hospital |
| Community Theatre |
| Conant's Cabin and Park |
| Congregation Beth Israel Synagogue |
| Congregation Sharey Tzedek Synagogue |
| Congress Apartments |
| Conifer Junction Schoolhouse |
| Connor Hall |
| Conroe Bridge |
| Conway Confederate Monument |
| Cooley, G. B., House |
| Cooley, Thomas M., High School |
| Coolidge, Calvin, Elementary School |
| Coolidge Woman's Club |
| Coos Bay National Bank Building |
| Copper Falls State Park |
| Coral Gables Congregational Church |
| Corona Apartments |
| Coronado Hotel |
| Cotton County Courthouse |
| Coughlin Campanile |
| Country Tea Room |
| Counts Hotel |
| Courtland School |
| Cowpens National Battlefield |
| Cox-Carlton Hotel |
| Cox, John F., Grammar School |
| Crabtree, Glen and Addie, Cabin |
| Crawford County Courthouse |
| Creamery Package Manufacturing Company Building |
| Crittenden Building |
| Crossnore Presbyterian Church |
| Crouse House |
| Culver Hotel |
| Cummings' Guest House |
| Curran, D. H. and Leah, House |
| Currier Gallery of Art |
| Curtiss, Glenn, House |
| Curtiss, Lua, House I |
Data from United States Park Service and Wikidata
