Pennsylvania - Significance region: Local
| Bridgewater Historic District |
| Brimmer, John, Tobacco Warehouse |
| Brinton, George, House |
| Brinton-King Farmstead |
| Bristol Historic District |
| Bristol Industrial Historic District |
| Broad Avenue 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, Gottlieb, Covered Bridge |
| Brownhill and Kramer Hosiery Mill |
| Brown, John, Tannery Site |
| Brown, Joseph H., School |
| Brownlee, Samuel, House |
| Brownlee, Scott, Covered Bridge |
| Brown-Moore Blacksmith Shop |
| Brownsburg Village Historic District |
| Brown's, George, Sons Cotton and Woolen Mill |
| Brownsville Commercial Historic District |
| Brownsville Northside Historic District |
| Brumbaugh Homestead |
| Brush Creek Salems Church |
| Brush Hill |
| Bucher, Joseph, House |
| Bucher Thal Historic District |
| Buck, A. W., House |
| Buckmanville Historic District |
| Buckwalter Building |
| Budd, Edward G., Manufacturing Company |
| Buffalo Presbyterian Church |
| Buffalo, Rochester & Pittsburgh Railway Indiana Passenger Station |
| Buick Motor Company Building |
| Bull, Thomas, House |
| Burgholtshouse |
| Burk Brothers and Company |
| Burnside Plantation |
| Burns, Jeremiah, Farm |
| Burnt Cabins Gristmill Property |
| Burnt Cabins Historic District |
| Burroughs, John, Homestead |
| Burtner Stone House |
| Butler County Courthouse |
| Butler County National Bank |
| Butler Historic District |
| Butler House |
| Butler Street Gatehouse |
| Butterworth, H.W. and Sons Company Building |
| Buttonwood Covered Bridge |
| Byecroft Farm Complex |
| Byerly House |
| Byers-Lyons House |
| Byers-Muma House |
| Byers Station Historic District |
| Byrnes & Kiefer Building |
| Caernarvon Presbyterian Church |
| Cairnwood |
| Caldwell Tavern |
| Callahan House |
| Callowhill Industrial Historic District |
| Caln Meeting House |
| Cambria City Historic District |
| Cambria County Courthouse |
| Cambria County Jail |
| Cambria Public Library Building |
| Camelot |
| Cameron, Col. James, House |
| Cameron County Courthouse |
| Cameron, Simon, House and Bank |
| Cameron, Simon, School |
| Campbell Building |
| Camp Curtin Fire Station |
| Camp Curtin Memorial Methodist Episcopal Church |
| Camptown Historic District |
| Camp-Woods |
| Carbaugh Run Rhyolite Quarry Site (36AD30) |
| Carbon County Jail |
| Carbondale City Hall and Courthouse |
| Carlisle Historic District |
| Carnegie, Andrew, Free Library |
| Carnegie Free Library |
| Carnegie Free Library |
| Carnegie Free Library, Beaver Falls |
| Carnegie Free Library of Allegheny |
| Carnell, Laura H., School |
| Carroll, Charles, Public School |
| Carson College for Orphan Girls |
| Carter-Worth House and Farm |
| Carver Court |
| Carversville Historic District |
| Cassese, Joseph, House |
Data from United States Park Service and Wikidata
