All - Constructed - 1890–1899
| Chautauqua Auditorium |
| Chesapeake & Ohio Railway Station |
| Chestnut Hill, The |
| Chicago and Norhwestern Railroad Depot |
| Chicago and North-Western Land Office |
| Chicago and Northwestern Railroad Depot |
| Chicago and North Western Railway Passenger Depot |
| Chicago Harbor Lighthouse |
| Chicago & Northwestern Passenger Depot and Baggage Room-Carroll |
| Chicago Public Library, Central Building |
| Chickamauga and Chattanooga National Military Park |
| Chickamauga Coal and Iron Company Coke Ovens |
| Chinworth Bridge |
| Chitwood, Joseph, House |
| Chivers, Thomas, Cellar |
| CHOCTAW (shipwreck) |
| Christ Church |
| Christ Church |
| Christ Church of LaCrosse |
| Christ Episcopal Church |
| Christian-Ellis House |
| Christian, Leigh, House |
| Church of St. Michael-Catholic |
| Church of the Assumption of the Virgin Mary |
| Church of the Good Shepherd |
| Church of the Holy Transfiguration of Christ-on-the-Mount |
| Church of the Saviour and Cemetery |
| Church San Juan Bautista of Maricao |
| City Blacksmith Shop |
| City Hall |
| City Hall |
| City National Bank Building |
| City Opera House |
| Civic Art Gallery |
| Claflin, Adams, House |
| Claflin School |
| Clareen-Peterson Restaurant Building |
| Claremont Stables |
| Clark County Jail |
| Clarke, Nehemiah P., House |
| Clark House |
| Clarksville Federal Building |
| Clary Mill |
| Claverack Free Library |
| Clay City National Bank Building |
| Clements, Le Vega, House |
| Cleveland Arcade |
| Cleveland County Training School |
| Cliffwood Hall |
| Clinch County Jail |
| Clinton Chapel AME Zion Church |
| Cnopius House |
| Cockerham Mill |
| Coffin, W.H., House |
| Cogan, James, House |
| Coheelee Creek Covered Bridge |
| Cold Spring Harbor Laboratory Historic District |
| Coleman Bridge |
| College Avenue Bridge |
| Collins Building |
| Collyer, Capt. Moses W., House |
| Colossal Cavern Entrance |
| Columbia River Quarantine Station |
| Columbus |
| Columbus City Hall |
| Columbus Monument |
| Colvin, Addison B., House |
| Commercial Bank Building |
| Condon Commercial Historic District (Boundary Increase) |
| Confederate Memorial Hall |
| Confederate Memorial in Nicholasville |
| Confederate Monument in Lawrenceburg |
| Confederate Monument in Louisville |
| Congregation Beth Israel Synagogue |
| Connecticut Avenue Bridge |
| Conrad, Charles E., Mansion |
| Conser, Peter, House |
| Cook County Criminal Court Building |
| Cook, George E., House |
| Copake Falls Methodist Episcopal Church |
| Copp's Hill Terrace |
| Coquille River Light |
| Corey House/Hotel |
| Cornell Mills |
| Cornell, W. J. and Nettie J., House |
| Corona High School |
| Cortesy, Anthony, House |
| Cossitt, Frederick H., Library |
| Coughlin School |
| County Line Baptist Church |
| Court Street Bridge |
| Coushatta Bank Building |
| Cousins Island Chapel |
| Cox House |
| Crafts Street City Stable |
| Cramer House |
| Crawford House |
| Crawford Irrigation Canal |
| Croke-Patterson-Campbell Mansion |
| Crooked River Lighthouse |
Data from United States Park Service and Wikidata
