Pennsylvania - Role: Building
| Brandywine Building and Loan Assoc. Rowhouses |
| Brashear, John A., House and Factory |
| Breezedale |
| Bregy, F. Amadee, School |
| Brendle Farms |
| Breslyn Apartments |
| Breyer, Henry W., Sr., House |
| Bridesburg School |
| Bridge Mill Farm |
| Brimmer, John, Tobacco Warehouse |
| Brinton, Edward, House |
| Brinton, George, House |
| Brinton-King Farmstead |
| Brinton's Mill |
| 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 Presbyterian Church and Manse |
| Brotherton Farm |
| Brownhill and Kramer Hosiery Mill |
| Brown, John, House |
| Brown, Joseph H., School |
| Brownlee, Samuel, House |
| Brown-Moore Blacksmith Shop |
| Brown's, George, Sons Cotton and Woolen Mill |
| Brumbaugh Homestead |
| Brush Creek Salems Church |
| Brush Hill |
| Bryn Mawr |
| Bryn Mawr Hotel |
| Buchanan, James, House |
| Bucher, Joseph, House |
| Buck, A. W., House |
| Buckingham Friends Meeting House |
| Buckingham Friends Meeting House |
| Buckwalter Building |
| Buffalo Presbyterian Church |
| Buffalo, Rochester & Pittsburgh Railway Indiana Passenger Station |
| Buhl Building |
| Buhl, Frank H., Mansion |
| Buick Motor Company Building |
| Bull, Thomas, House |
| Burgholtshouse |
| Burk Brothers and Company |
| Burke Building |
| Burnside Plantation |
| Burns, Jeremiah, Farm |
| Burnt Cabins Gristmill Property |
| Burroughs, John, Homestead |
| Burtner Stone House |
| Butler Armory |
| Butler County Courthouse |
| Butler County National Bank |
| Butler House |
| Butler Street Gatehouse |
| Butterworth, H.W. and Sons Company Building |
| Byecroft Farm Complex |
| Byerly House |
| Byers-Lyons House |
| Byers-Muma House |
| Byrnes & Kiefer Building |
| Caernarvon Presbyterian Church |
| Cairnwood |
| Caldwell Tavern |
| Callahan House |
| Caln Meeting House |
| Calvary Episcopal Church |
| Cambria County Courthouse |
| Cambria County Jail |
| Cambria Public Library Building |
| Camelot |
| Cameron, Col. James, House |
| Cameron County Courthouse |
| Cameron Estate |
| Cameron, Simon, House and Bank |
| Cameron, Simon, School |
| Campbell Building |
| Camp Curtin Fire Station |
| Camp Curtin Memorial Methodist Episcopal Church |
| Camp-Woods |
| Canonsburg Armory |
| Carbon County Jail |
| Carbondale City Hall and Courthouse |
| Carlisle Armory |
| Carl Mackley Houses |
| Carnegie, Andrew, Free Library |
| Carnegie Free Library |
| Carnegie Free Library |
| Carnegie Free Library, Beaver Falls |
| Carnegie Free Library of Allegheny |
| Carnegie Free Library Of Braddock |
| Carnegie Institute and Library |
| Carnell, Laura H., School |
| Carpenters' Hall |
Data from United States Park Service and Wikidata
