Connecticut - Area of significance: Invention
| Allis-Bushnell House |
| Armsmear |
| Ball and Roller Bearing Company |
| Brooks, Hervey, Pottery Shop and Kiln Site |
| Case Brothers Historic District |
| Charter Oak Place |
| Collinsville Historic District |
| Colt Industrial District |
| Gallaher Estate |
| Hayward House |
| Holmes, Francis H., House |
| Howe, John I., House |
| Ivoryton Historic District |
| Landers, Frary and Clark Ellis Street Plant Historic District |
| Lyman Viaduct |
| Maltby-Stevens Factory Site |
| Marion Castle, Terre Bonne |
| Norton, Charles H., House |
| Pinto, William, House |
| Russell Company Upper Mill |
| Salem Historic District |
| Simeon North Factory Site |
| Southbury Historic District No. 1 |
| South End Historic District |
| Terry-Hayden House |
| Underwood Computing Machine Company Factory |
| U.S.S. NAUTILUS (submarine) |
| Verneur Pratt Historic District |
| Westville Village Historic District |
Data from United States Park Service and Wikidata
