Connecticut - Area of significance: Transportation
| Armstrong, M. and Company Carriage Factory |
| Arrawanna Bridge |
| BERKSHIRE NO. 7 |
| Black Horse Tavern |
| Blackledge River Railroad Bridge |
| Boardman's Bridge |
| Branchville Railroad Tenement |
| Branford Electric Railway Historic District |
| Bridge #2305 |
| Bridge No. 1132 |
| Bridge No. 455 |
| Bridge No. 560 |
| Bulkeley Bridge |
| Bull's Bridge |
| Burnett's Corner Historic District |
| Burnham Tavern |
| Butts Bridge |
| Canaan Village Historic District |
| Central Vermont Railroad Pier |
| Chivvis, Arthur and Lyn, House |
| Connecticut Valley Railroad Roundhouse and Turntable Site |
| Cornwall Bridge Railroad Station |
| Cos Cob Power Station |
| Cos Cob Railroad Station |
| Darling Family Farmstead and Tavern |
| Deep River Freight Station |
| Downtown New London Historic District |
| Downtown Norwich Historic District |
| Dudley, Jedidiah, House |
| Durisol House |
| ELMER S. DAILEY |
| EMMA C. BERRY (Fishing Sloop) |
| Enfield Canal |
| Essex Freight Station |
| Fairfield Railroad Stations |
| Falkner's Island Lighthouse |
| Falls Village District |
| Farmington Canal Lock |
| Farmington Canal Lock No. 13 |
| Farmington Canal-New Haven and Northampton Canal |
| Farmington River Railroad Bridge |
| Five Mile Point Lighthouse |
| Forestville Passenger Station |
| Glastonbury-Rock Hill Ferry Historic District |
| Great Captain Island Lighthouse |
| Greens Ledge Lighthouse |
| Hadlyme Ferry Historic District |
| Hamburg Bridge Historic District |
| Hartford Union Station |
| Housatonic Railroad Station |
| Housatonic River Railroad Bridge |
| Keeler Tavern |
| L. A. DUNTON |
| Lakeville Historic District |
| Lee, John Black, House I |
| Lover's Leap Bridge |
| Lyman Viaduct |
| Lynde Point Lighthouse |
| Main Street Bridge |
| Main Street Historic District |
| Merritt Parkway |
| Merwinsville Hotel |
| Mianus River Railroad Bridge |
| Mill Brook Bridge |
| Mills, Beaven W., House |
| Mills, Willis N, House |
| Mystic Bridge Historic District |
| New Haven Railroad Danbury Turntable |
| New Haven Railroad Station |
| Newington Junction Railroad Depot |
| New London Harbor Lighthouse |
| New London Ledge Lighthouse |
| New London Railroad Station |
| Noank Historic District |
| North Stonington Village Historic District |
| Norwalk Island Lighthouse |
| Norwalk River Railroad Bridge |
| Old Westfield Cemetery |
| Peck Ledge Lighthouse |
| Peck Tavern |
| Penfield Reef Lighthouse |
| Pequabuck Bridge |
| Pequonnock River Railroad Bridge |
| Perry Avenue Bridge |
| Pine Creek Park Bridge |
| Pines Bridge Historic District |
| PRICILLA DAILEY |
| Putnam Railroad Station |
| Rapallo Viaduct |
| Reynolds Bridge |
| Rising Sun Tavern |
| River Road Stone Arch Railroad Bridge |
| Riverside Avenue Bridge |
| Route 146 Historic District |
| Rowayton Depot Historic District |
| SABINO (steamer) |
| Saugatuck River Bridge |
| Saugatuck River Railroad Bridge |
| Saybrook Breakwater Lighthouse |
| Sharon Valley Historic District |
Data from United States Park Service and Wikidata
