Connecticut - Criteria: D (information potential)
| Avery, Thomas, House |
| Beaver Meadow Complex Prehistoric Archeological District |
| Beckley Furnace |
| Bennett Rockshelter |
| Blakeslee, Joseph, House |
| BOC Site |
| Brooks, Hervey, Pottery Shop and Kiln Site |
| Cain, Hugh, Fulling Mill and Elias Glover Woolen Mill Archeological Site |
| Camps Nos. 10 and 41 of Rochambeau's Army |
| CHRISTEEN (oyster sloop) |
| Connecticut Valley Railroad Roundhouse and Turntable Site |
| Cooper Site |
| Cos Cob Power Station |
| Coventry Glass Factory Historic District |
| Daniel's Village Archeological Site |
| Eldredge Mills Archeological District |
| Farmington Canal-New Haven and Northampton Canal |
| Fifth Camp of Rochambeau's Infantry |
| Fort Nathan Hale |
| Fort Shantok |
| Fort Stamford Site |
| Gillette's Grist Mill |
| Gurleyville Historic District |
| Hamburg Cove Site |
| Hazardville Historic District |
| Hemlock Glen Industrial Archeological District |
| Hooker, Sarah Whitman, House |
| Indian Hill Avenue Historic District |
| Kent Iron Furnace |
| Lighthouse Archeological Site (5-37) |
| Little Pootatuck Brook Archeological Site |
| Lyman Viaduct |
| Maltby-Stevens Factory Site |
| Mashantucket Pequot Reservation |
| Middle Haddam Historic District |
| Middletown Upper Houses Historic District |
| Milton Center Historic District |
| Mount Riga Ironworks Site |
| New England Hebrew Farmers of the Emanuel Society Synagogue and Creamery Site |
| New Roxbury Ironworks Site |
| New York Belting and Packing Co. |
| Nichols Satinet Mill Site |
| Northfield Knife Company Site |
| Old Mine Park Archeological Site |
| Pequot Fort |
| Pitkin Glassworks Ruin |
| Quinebaug River Prehistoric Archeological District |
| Ramsdell, Hezekiah S., Farm Site |
| Rapallo Viaduct |
| Revolutionary War Campsite |
| Roaring Brook I Site |
| Rockrimmon Rockshelter |
| Roxbury Iron Mine and Furnace Complex |
| Selden Island Site |
| Sharon Valley Historic District |
| Sharpe's Trout Hatchery Site |
| Simeon North Factory Site |
| Terryville Waterwheel |
| Valley Falls Cotton Mill Site |
| Waterbury Brass Mill |
| West Goshen Historic District |
| Whitney, Eli, Gun Factory |
| Wilcox, Crittenden Mill |
Data from United States Park Service and Wikidata
