All - Constructed - 1860–1869
| Brenham Downtown Historic District |
| Bridgeton Bridge |
| Brighton Heights Reformed Church |
| Brighton School |
| Brine, George, House |
| Brockway, Abel, House |
| Brooklyn No. 4 Fire House |
| Brooks, Samuel, House |
| Brown, Dr. Charles Fox, House |
| Brown, Isaac, House |
| Bruce, Blanche K., House |
| Brush, Jared L., Barn |
| Buckingham, John, House |
| Buckridge Ranch House |
| Buffat, Alfred, Homestead |
| Building at One Pendleton Place |
| Bunker Hill School |
| Burrington Covered Bridge |
| Burt, Armistead, House |
| Butler, A. B., House |
| Butte-Anaconda Historic District |
| Calvary Episcopal Church and Churchyard |
| Cambridge Street School |
| Camp Nelson National Cemetery |
| Camp Spring House |
| Cana Island Lighthouse |
| Canary-Hartnett House |
| Cape Arago Lighthouse |
| Carretera Central |
| Cassidy, Daniel, and Sons General Merchandise Store |
| Cassidy Farmhouse |
| Caswell County Courthouse |
| Cathedral of Our Merciful Saviour |
| Cathedral of St. George Historic District |
| Cathedral of the Immaculate Conception |
| Cedar Point Light |
| Centenary Collegiate Institute |
| Centennial Hall-Edward Waters College |
| Center Building-Minnesota Hospital for The Insane |
| Center Methodist Church |
| Central Congregational Church |
| Central Fire Station |
| Central House Hotel |
| Central National Bank |
| Central United Methodist Church |
| Centre Covered Bridge |
| Ceylon Covered Bridge |
| Chamberlain, Samuel, House |
| Chambers Island Lighthouse |
| Chapel of St. Mary the Virgin |
| Chatham Manufacturing Company-Western Electric Company |
| Chattanooga National Cemetery |
| Chaves, Felipe, House |
| Chavez, Rumaldo, House |
| Cheatham County Courthouse |
| Cheatham, John E., House |
| Cheboygan County Courthouse |
| Cherokee Ranch |
| Cherry Grove Plantation |
| China Grove Methodist Church |
| Choy, Sam, Brick Store |
| Christ Church |
| Christ Church Complex |
| Christ Episcopal Church |
| Christ Evangelical Church |
| Church of St. Joseph-Catholic |
| Church of the Annunciation |
| Church of the Holy Comforter |
| Church of the Holy Trinity-Catholic |
| Church of the Incarnation and Parish House |
| Church Santiago Apostol of Fajardo |
| Church, Seymour, House |
| Church, Volney-Carlos B. Shotwell House |
| City Point National Cemetery |
| Civil War Earthworks at Tallahatchie Crossing |
| Clearfield County Courthouse |
| Cobb House |
| Cobblestone House |
| Code House |
| Colby Hall |
| Cold Harbor National Cemetery |
| Cold Spring Cemetery Gatehouse |
| Cole House |
| Colgate, Robert, House |
| College of Wooster |
| Coman House |
| Compton Hill Water Tower |
| Condit House |
| Confederate Monument in Cynthiana |
| Connecticut General Hospital for the Insane |
| Conner, Wesley O., House |
| Connors House |
| Cooper Cabin |
| Copeland House |
| Corcoran Gallery of Art |
| Cornish-Windsor Covered Bridge |
| Cornwall Brothers' Store |
| Cornwall Furnace |
| Court Street Methodist Church |
| Covington and Cincinnati Suspension Bridge |
Data from United States Park Service and Wikidata
