Connecticut - Significance region: National
| Old Wethersfield Historic District |
| Oliver White Tavern |
| Palmer, Capt. Nathaniel B., House |
| Park Apartments |
| Pequot Fort |
| Pine Creek Park Bridge |
| PRICILLA DAILEY |
| Putnam Hill Historic District |
| Rapallo Viaduct |
| Reeve, Tapping, House and Law School |
| Remington City Historic District |
| Remington, Frederic, House |
| Remington Village Historic District |
| Riverside Avenue Bridge |
| Rock Ledge |
| Rogers, John, Studio |
| SABINO (steamer) |
| Saugatuck River Bridge |
| Seaside Village Historic District |
| Seventh Sister |
| Sherman, David, House |
| Simeon North Factory Site |
| Southbury Training School |
| Stanley-Whitman House |
| Stevenson Dam Hydroelectric Plant |
| Steward's House, Foreign Mission School |
| St. James' Episcopal Church |
| Stonington Borough Historic District |
| Stowe, Harriet Beecher, House |
| Sturges, Jonathan, House |
| Sun Terrace |
| Tarbell, Ida, House |
| Thames Shipyard |
| Trinity College Long Walk Historic District |
| Trumbull, John, Birthplace |
| Twain, Mark, House |
| U.S.S. NAUTILUS (submarine) |
| Wadsworth Atheneum |
| War Office |
| Waterbury Clock Company |
| Waterbury Municipal Center Complex |
| Webb, Joseph, House |
| Webster, Noah, Birthplace |
| Weir Farm National Historic Site |
| Weir, J. Alden, Farm Historic District |
| Whitfield, Henry, House |
| Whitney, Eli, Gun Factory |
| Wilcox, Crittenden Mill |
| Williams and Stancliff Octagon Houses |
| Williams, Austin F., Carriagehouse and House |
| Williams, William, House |
| Wilmot Apartments Historic District |
| Wolcott, Oliver, House |
| Yale Bowl |
Data from United States Park Service and Wikidata
