Connecticut - Area of significance: Architecture
| Bissell Tavern-Bissell's Stage House |
| Black Horse Tavern |
| Blackman, Elisha, Building |
| Black Rock Gardens Historic District |
| Black Rock Historic District |
| Blackstone House |
| Blakeslee Forging Company |
| Blakeslee, Joseph, House |
| Bloomfield Avenue Meeting House |
| Bolton Green Historic District |
| Boothe Homestead |
| Booth, Nathan B., House |
| Boston Post Road Historic District |
| Bosworth, Benjamin, House |
| Bowen, Henry C., House |
| Bowen, Mathew, Homestead |
| Bozrah Congregational Church and Parsonage |
| B.P.O. Elks Lodge |
| Brace, Moses-Uriah Cadwell House |
| Bradford-Huntington House |
| Bradley Edge Tool Company Historic District |
| Bradley-Hubbell House |
| Bradley, Icabod, House |
| Bradley, Timothy, House |
| Bradley-Wheeler House |
| Braman Camp |
| Branchville Railroad Tenement |
| Branford Center Historic District |
| Branford House |
| Branford Point Historic District |
| Breuer, Marcel, House II |
| Brewer, Selden, House |
| Brewster Homestead |
| Bridge No. 1603 |
| Bridge No. 1604 |
| Bridge No. 1605 |
| Bridge No. 1860 |
| Bridgeport City Hall |
| Bridgeport Downtown North Historic District |
| Bridgeport Downtown South Historic District |
| Bridge Street Historic District |
| Bridgewater Center Historic District |
| Brigham's Tavern |
| Bristol Girls' Club |
| Bristol High School |
| Broad Brook Company |
| Broad Street-Davis Park Historic District |
| Broad Street Green Historic District |
| Broad Street Historic District |
| Broad Street School |
| Bronson, Aaron, House |
| Bronson, Josiah, House |
| Bronson Windmill |
| Brookfield Center Historic District |
| Brooklyn Green Historic District |
| Brown Tavern |
| Bryan, Roderick, House |
| Buckingham House |
| Buckingham Square District |
| Building at 136-138 Collins Street |
| Building at 142 Collins Street |
| Building at 83-85 Sigourney Street |
| Bulkeley School |
| Bull, Amos, House |
| Bull, Capt. William, Tavern |
| Bullet Hill School |
| Burgis II, Thomas, House |
| Burlington-Harmony Hill Roads Historic District |
| Burnett's Corner Historic District |
| Burnham, Edward L., Farm |
| Burnham Tavern |
| Burrall-Belden House |
| Burritt Hotel |
| Burwell, Ernest R., House |
| Bush Hill Historic District |
| Bush-Holley House |
| Bushnell, Benjamin, Farm |
| Bushnell-Dickinson House |
| Bushnell, Elisha, House |
| Butler, James, House |
| Butler, Roger, House |
| Buttolph-Williams House |
| Byram School |
| Cady-Copp House |
| Cady, John, House |
| Caleb Pratt House |
| Calhoun-Ives Historic District |
| Camp Bethel |
| Camp, Moses, House |
| Canaan Pine Grove Association Camp Meeting |
| Canaan Village Historic District |
| Cannondale Historic District |
| Canterbury Center Historic District |
| Canton Center Historic District |
| Capen-Clark Historic District |
| Capewell Horse Nail Company |
| Capron-Phillips House |
| Captain Nathan Hale Monument |
| Cargill Falls Mill (Wilkinson Mill) |
| Carpenter House |
Data from United States Park Service and Wikidata
