Connecticut - Area of significance: Historic - Non-aboriginal
| Alden Tavern Site |
| Avery, Thomas, House |
| Beckley Furnace |
| Blakeslee, Joseph, House |
| Brooks, Hervey, Pottery Shop and Kiln Site |
| Burnham Tavern |
| Cain, Hugh, Fulling Mill and Elias Glover Woolen Mill Archeological Site |
| Commonwealth Works Site |
| Connecticut Valley Railroad Roundhouse and Turntable Site |
| Cos Cob Power Station |
| Coventry Glass Factory Historic District |
| Daniel's Village Archeological Site |
| Farmington Canal-New Haven and Northampton Canal |
| Fifth Camp of Rochambeau's Infantry |
| Fort Nathan Hale |
| Fort Stamford Site |
| Gillette's Grist Mill |
| Gurleyville Historic District |
| Hammanasset Paper Mill Site |
| Hazardville Historic District |
| Hemlock Glen Industrial Archeological District |
| Hooker, Sarah Whitman, House |
| Indian Hill Avenue Historic District |
| Kent Iron Furnace |
| Lawrence, Isaac, House |
| Lighthouse Archeological Site (5-37) |
| Lyman Viaduct |
| Maltby-Stevens Factory Site |
| Middle Haddam Historic District |
| Middletown Upper Houses Historic District |
| Milton Center Historic District |
| Mount Riga Ironworks Site |
| New England Cement Company Kiln and Quarry |
| New England Hebrew Farmers of the Emanuel Society Synagogue and Creamery Site |
| New Roxbury Ironworks Site |
| Nichols Satinet Mill Site |
| Northfield Knife Company Site |
| Old Mine Park Archeological Site |
| Pequot Fort |
| Pitkin Glassworks Ruin |
| Ramsdell, Hezekiah S., Farm Site |
| Rapallo Viaduct |
| Revolutionary War Campsite |
| Roxbury Iron Mine and Furnace Complex |
| Sharon Valley Historic District |
| Sharpe's Trout Hatchery Site |
| Simeon North Factory Site |
| Talcottville Historic District |
| Valley Falls Cotton Mill Site |
| Waterbury Brass Mill |
| Weir Farm National Historic Site |
| West Goshen Historic District |
| Wilcox, Crittenden Mill |
Data from United States Park Service and Wikidata
