Connecticut - Significance region: Local
| Abbott, George S., Building |
| Abington Congregational Church |
| Academy Hall |
| Acadian House |
| Aeolian Company Factory Complex |
| Agudath Sholem Synagogue |
| Ahavas Sholem Synagogue |
| Alldis, James, House |
| Allen's Cider Mill |
| Ambassador Apartments |
| American Thermos Bottle Company Laurel Hill Plant |
| American Thread Company |
| Andover Center Historic District |
| Andrews, Luman, House |
| Andrews, Moses, House |
| Andrew, William, House |
| Anshei Israel Synagogue |
| Ansonia Library |
| Applewood Farm |
| Armstrong, M. and Company Carriage Factory |
| Ashford Academy |
| Ashlawn |
| Atwater, George, House |
| Atwater Manufacturing Company |
| Avery Homestead |
| Avery Point Lighthouse |
| Avery, Thomas, House |
| Avon Congregational Church |
| Babb's Beach |
| Backus, Nathaniel, House |
| Bacon Academy |
| Baldwin, Amos, House |
| Baldwin, George, House |
| Barkhamsted Center Historic District |
| Barlow, Aaron, House |
| Barnes-Frost House |
| Barnes, Selah, House |
| Barns, Acors, House |
| Bartlett, Daniel and Esther, House |
| Batterson Block |
| Beach, Charles E., House |
| Beardsley, Capt. Philo, House |
| Beardsley-Mix House |
| Bedford-Garden Streets Historic District |
| Belden, Horace, School and Central Grammar School |
| Bellamy, Joseph, House |
| Bemont, Makens, House |
| Benedict, Francis Jr., House |
| Benedict House and Shop |
| Beth El Synagogue |
| Beth Hamedrash Hagodol Synagogue |
| Bikur Cholim Synagogue |
| Bingham, Clarence A., School |
| Bishop, Peyton Randolph, House |
| Bishop School |
| Bissell, Henry B., House |
| Bissell Tavern-Bissell's Stage House |
| Blackledge River Railroad Bridge |
| Blackman, Elisha, Building |
| Blakeslee Forging Company |
| Blakeslee, Joseph, House |
| Boothe Homestead |
| Booth, Nathan B., House |
| Bosworth, Benjamin, House |
| Bowen, Mathew, Homestead |
| Bozrah Congregational Church and Parsonage |
| Bradley-Hubbell House |
| Bradley, Icabod, House |
| Branchville Railroad Tenement |
| Brewer, Selden, House |
| Brewster Homestead |
| Bridgeport City Hall |
| Bridge Street Historic District |
| Bristol Girls' Club |
| Broad Brook Company |
| Broad Street Green Historic District |
| Bronson, Aaron, House |
| Bronson, Josiah, House |
| Bronson Windmill |
| Brooks, Hervey, Pottery Shop and Kiln Site |
| Brown Tavern |
| Bryan, Roderick, House |
| Buckingham House |
| Bull, Amos, House |
| Bull, Capt. William, Tavern |
| Burgis II, Thomas, House |
| Burnham, Edward L., Farm |
| Burnham Tavern |
| Burrall-Belden House |
| Burritt Hotel |
| Burwell, Ernest R., House |
| Bushnell, Benjamin, Farm |
| Bushnell-Dickinson House |
| Butler, Roger, House |
| Byram School |
| Cady-Copp House |
| Cady, John, House |
| Caleb Pratt House |
| Camp, Moses, House |
| Canaan Pine Grove Association Camp Meeting |
Data from United States Park Service and Wikidata
