Connecticut - Criteria: A (event)
| Bulkeley Bridge |
| Bulkeley School |
| Bull's Bridge |
| Burnett's Corner Historic District |
| Burnham, Edward L., Farm |
| Burrall-Belden House |
| Burritt Hotel |
| Bush Hill Historic District |
| Bush-Holley House |
| Bushnell Park |
| Butler, James, House |
| Butts Bridge |
| Cady-Copp House |
| Calhoun-Ives Historic District |
| Camp Bethel |
| Canaan Village Historic District |
| Cannondale Historic District |
| Canoe Brook Historic District |
| Canterbury Center Historic District |
| Canton Center Historic District |
| Capewell Horse Nail Company |
| Cargill Falls Mill (Wilkinson Mill) |
| Carpenter, Joseph, Silversmith Shop |
| Carroll Building |
| Case, Benomi, House |
| Case Brothers Historic District |
| Cedar Hill Cemetery |
| Center Burying Yard, Old |
| Center Street Cemetery |
| Central Avenue-Center Cemetery Historic District |
| Central Vermont Railroad Pier |
| Central Village Historic District |
| Chapel Street Historic District |
| Chapin, Philip, House |
| Chaplin Historic District |
| Chapman, David, Farmstead |
| Chapman, Taylor, House |
| CHARLES W. MORGAN |
| Charter Oak Firehouse |
| Chatfield Farmstead |
| Chelsea Parade Historic District |
| Cheney Brothers Historic District |
| Cheney Building |
| Children's Village of the Hartford Orphan Asylum |
| Chivvis, Arthur and Lyn, House |
| CHRISTEEN (oyster sloop) |
| Christ Episcopal Church and Tashua Burial Ground |
| Church Farm |
| Church of the Good Shepherd and Parish House |
| Church of the Holy Name |
| Church of the Holy Trinity and Rectory |
| City Hall-Monument District |
| Civic Institutions Historic District |
| Clark Brothers Factory No. 2 |
| Clark Farm Tenant House Site |
| Clay Hill Historic District |
| Clinton Village Historic District |
| Coit Street Historic District |
| Colchester Village Historic District |
| Colebrook Store |
| Collinsville Historic District |
| Colt Industrial District |
| Colton, Benjamin, House |
| Columbia Green Historic District |
| Commercial Trust Company Building |
| Commodore Hull School |
| Commonwealth Works Site |
| Compo-Owenoke Historic District |
| Comstock, Abijah, House |
| Comstock-Cheney Hall |
| Connecticut Agricultural Experiment Station |
| Connecticut General Hospital for the Insane |
| Connecticut General Life Insurance Company Headquarters |
| Connecticut Hall, Yale University |
| Connecticut Statehouse |
| Connecticut State Library and Supreme Court Building |
| Connecticut Valley Hospital Cemetery |
| Connecticut Valley Railroad Roundhouse and Turntable Site |
| Cook, John, House |
| Cornwall Bridge Railroad Station |
| Cos Cob Power Station |
| Cos Cob Railroad Station |
| Cove Island Houses |
| Coventry Glass Factory Historic District |
| Crandall, Prudence, House |
| Crawford, George W., Manor |
| Cream Hill Agricultural School |
| Cream Hill Shelter |
| Curtis Memorial Library |
| Curtisville Historic District |
| Danielson Main Street Historic District |
| Daniel's Village Archeological Site |
| Darling Family Farmstead and Tavern |
| Day House |
| Dayville Historic District |
| Deacon's Point Historic District |
| Deep River Freight Station |
| Deep River Town Hall |
| Department Store Historic District |
| Deshon-Allyn House |
Data from United States Park Service and Wikidata
