Connecticut - Criteria: A (event)
| Division Street Historic District |
| Doane's Sawmill/Deep River Manufacturing Company |
| DORIS (Sailing yacht) |
| Dorrance Inn |
| Downtown Main Street Historic District |
| Downtown New Britain |
| Downtown New London Historic District |
| Downtown North Historic District |
| Downtown Norwich Historic District |
| Downtown Seymour Historic District |
| Downtown Torrington Historic District |
| Downtown Waterbury Historic District |
| Dudleytown Historic District |
| Durisol House |
| Dwight Street Historic District |
| East Bridgeport Historic District |
| East District School |
| East Granby Historic District |
| East Haddam Historic District |
| East Haven Green Historic District |
| East Main Street Historic District |
| East Plymouth Historic District |
| East Weatogue Historic District |
| East Windsor Academy |
| East Windsor Hill Historic District |
| Edgewood Park Historic District |
| Elliottville Lower Mill |
| Ellsworth, Horace H., House |
| Ellsworth, Oliver, Homestead |
| Elmore Houses |
| Elm Street Historic District |
| Elton Hotel |
| Ely, Rev. John, House |
| EMMA C. BERRY (Fishing Sloop) |
| Emmanuel Church |
| Endee Manor Historic District |
| Enfield Canal |
| Enfield Shakers Historic District |
| Engine Company 15 Fire Station |
| Engine Company 16 Fire Station |
| Engine Company 1 Fire Station |
| Engine Company 2 Fire Station |
| Engine Company 6 Fire Station |
| Engine Company 9 Fire Station |
| Eolia-Harkness Estate |
| Esperanza |
| Essex Freight Station |
| Fairfield Avenue Historic District |
| Fairfield County Courthouse |
| Fairfield County Jail |
| Fairfield Historic District |
| Falkner's Island Lighthouse |
| Falls Village District |
| Fanning, Capt. Thomas, Farmstead |
| Farmington Canal Lock |
| Farmington Canal-New Haven and Northampton Canal |
| Farmington Historic District |
| Farmington River Railroad Bridge |
| Farnsworth, Samuel, House |
| Farwell Barn |
| Federal Hill Historic District |
| Fenwick Historic District |
| Fifth Camp of Rochambeau's Infantry |
| Filley, Capt. Oliver, House |
| First Church of Christ |
| First Church of Christ and the Ancient Burying Ground |
| First Church Parsonage |
| First Congregational Church of East Hartford and Parsonage |
| First Congregational Church of East Haven |
| First Congregational Church of Plainfield |
| First Lutheran Church of the Reformation |
| Five Mile Point Lighthouse |
| Florence Mill |
| Footguard Hall |
| Ford, Elinor and Sherman, House |
| Forestville Passenger Station |
| Former Fire Station |
| Fort Griswold |
| Fort Nathan Hale |
| Fort Shantok |
| Fort Stamford Site |
| Fort Trumbull |
| Foster, Stephen and Helen, House |
| Fourth Congregational Church |
| Fourth District School |
| Fourth Ward Historic District |
| Freeman, Mary and Eliza, Houses |
| Frisbie, Edward, Homestead |
| Frog Hollow |
| Fuller, John, House |
| Garvan-Carroll Historic District |
| Gateway Village Historic District |
| Georgetown Historic District |
| Gilbert Clock Factory |
| Gillett, Asa, House |
| Gillette's Grist Mill |
| Glastonbury-Rock Hill Ferry Historic District |
| Glebe House |
| Glen Falls Bridge |
| Glenville Historic District |
Data from United States Park Service and Wikidata
