Connecticut - Criteria: A (event)
| Academy Hall |
| Acadian House |
| Ahavas Sholem Synagogue |
| Alden Tavern Site |
| Aldrich Free Public Library |
| Allen Place-Lincoln Street Historic District |
| Allen's Cider Mill |
| Alsop, Richard IV, House |
| Ambassador Apartments |
| American Legion Forest CCC Shelter |
| American Mills Web Shop |
| American Thermos Bottle Company Laurel Hill Plant |
| American Thread Company |
| Andover Center Historic District |
| Ann Street Historic District |
| Ansonia Library |
| Applewood Farm |
| Armstrong, M. and Company Carriage Factory |
| Arrawanna Bridge |
| Ashford Academy |
| Aspetuck Historic District |
| Atwater Manufacturing Company |
| Austin, A. Everett, House |
| Avery Homestead |
| Avery Point Lighthouse |
| Avery, Thomas, House |
| Avon Congregational Church |
| Babb's Beach |
| Bacon Academy |
| Baldwin, Amos, House |
| Baldwin, Caleb, Tavern |
| Baldwin, Timothy, House |
| Baldwin, Zaccheus, House |
| Ball and Roller Bearing Company |
| Baltic Historic District |
| Bank Street Historic District |
| Barber, Giles, House |
| Barkhamsted Center Historic District |
| Barlow, Aaron, House |
| Basset, Daniel, House |
| Beach, Samuel, House |
| Bean Hill Historic District |
| Beardsley-Mix House |
| Beardsley Park |
| Beaver Hills Historic District |
| Beckley Furnace |
| Belltown Historic District |
| Benedict, Francis Jr., House |
| Benedict House and Shop |
| BERKSHIRE NO. 7 |
| Bigelow-Hartford Carpet Mills |
| Bigelow-Hartford Carpet Mills Historic District |
| Bill, Gurdon, Store |
| Bingham, Clarence A., School |
| Birdcraft Sanctuary |
| Birmingham Green Historic District |
| Bishop, Peyton Randolph, House |
| Bishop School |
| Black Horse Tavern |
| Blackledge River Railroad Bridge |
| Blackman, Elisha, Building |
| Black Rock Gardens Historic District |
| Black Rock Historic District |
| Blackstone House |
| Blakeslee Forging Company |
| Boardman's Bridge |
| Bolton Green Historic District |
| Bowen, Mathew, Homestead |
| Bozrah Congregational Church and Parsonage |
| Brace, Moses-Uriah Cadwell House |
| Bradley Edge Tool Company Historic District |
| Bradley-Hubbell House |
| Bradley, Timothy, House |
| Branchville Railroad Tenement |
| Branford Center Historic District |
| Branford Electric Railway Historic District |
| Brayton Grist Mill |
| Breuer, Marcel, House II |
| Brewster Homestead |
| Bridge #2305 |
| Bridge No. 1132 |
| Bridge No. 1603 |
| Bridge No. 1604 |
| Bridge No. 1605 |
| Bridge No. 1860 |
| Bridge No. 455 |
| Bridge No. 560 |
| Bridgeport City Hall |
| Bridge Street Historic District |
| Bridgewater Center Historic District |
| Bristol Girls' Club |
| Bristol High School |
| Broad Street-Davis Park Historic District |
| Broad Street Green Historic District |
| Broad Street Historic District |
| Broad Street School |
| Bronson, Josiah, House |
| Brookfield Center Historic District |
| Brooklyn Green Historic District |
| Brooks, Hervey, Pottery Shop and Kiln Site |
Data from United States Park Service and Wikidata
