Pennsylvania - Area of significance: Architecture
| Boughner, Alexander V., House |
| Bowman Homestead |
| Bowman, Jacob, Tobacco Warehouse |
| Bowman's Castle |
| Bowmansville Roller Mill |
| Boyce Station |
| Boyer-Mertz Farm |
| Boyer, Riter, House |
| Bradford Armory |
| Bradford County Courthouse |
| Bradford, David, House |
| Bradford Downtown Historic District |
| Bradford Friends Meetinghouse |
| Bradford Old City Hall |
| Brandywine Building and Loan Assoc. Rowhouses |
| Brandywine Summit Camp Meeting |
| Breezedale |
| Bregy, F. Amadee, School |
| Brendle Farms |
| Breslyn Apartments |
| Brewerytown Historic District |
| Breyer, Henry W., Sr., House |
| Bridesburg School |
| Bridgewater Historic District |
| Brier Hill |
| Brimmer, John, Tobacco Warehouse |
| Brinton, Edward, House |
| Brinton, George, House |
| Brinton-King Farmstead |
| Brinton's Mill |
| Bristol Historic District |
| Bristol Industrial Historic District |
| Broad Avenue Historic District |
| Broad Street Historic District |
| Broad Street Market |
| Brobst Mill |
| Brockerhoff Hotel |
| Brockerhoff Mill |
| Brockwayville Passenger Depot, Buffalo, Rochester and Pittsburgh Railroad |
| Brodbeck, S. B., Housing |
| Brodhead Farm |
| Brooklawn |
| Brooks, George L., School |
| Brookville Historic District |
| Brookville Presbyterian Church and Manse |
| Brotherton Farm |
| Brown, Joseph H., School |
| Brownlee, Samuel, House |
| Brownsburg Village Historic District |
| Brownsville Commercial Historic District |
| Brownsville Northside Historic District |
| Brumbaugh Homestead |
| Brush Creek Salems Church |
| Brush Hill |
| Bryn Athyn Historic District |
| Bryn Mawr College Historic District |
| Bryn Mawr Hotel |
| Bucher, Joseph, House |
| Bucher Thal Historic District |
| Buck, A. W., House |
| Buckingham Friends Meeting House |
| Buckingham Friends Meeting House |
| Buckmanville Historic District |
| Buckwalter Building |
| Buffalo Presbyterian Church |
| Buffalo, Rochester & Pittsburgh Railway Indiana Passenger Station |
| Buhl Building |
| Buhl, Frank H., Mansion |
| Bull, Thomas, House |
| Burgholtshouse |
| Burke Building |
| Burnside Plantation |
| Burns, Jeremiah, Farm |
| Burnt Cabins Historic District |
| Burroughs, John, Homestead |
| Burtner Stone House |
| Butler Armory |
| Butler County Courthouse |
| Butler County National Bank |
| Butler Historic District |
| Butler House |
| Butler Street Gatehouse |
| Butler Veterans Administration Hospital Historic District |
| Byecroft Farm Complex |
| Byerly House |
| Byers-Lyons House |
| Byers-Muma House |
| Byers Station Historic District |
| Byrnes & Kiefer Building |
| Caernarvon Presbyterian Church |
| Cairnbrook Historic District |
| Cairnwood |
| Caldwell Tavern |
| Callahan House |
| Callowhill Industrial Historic District |
| Caln Meeting House |
| Calvary Episcopal Church |
| Cambria City Historic District |
| Cambria County Courthouse |
| Cambria County Jail |
Data from United States Park Service and Wikidata
