Pennsylvania - Criteria: A (event)
| 26th District Police and Patrol Station |
| 32nd St. and Lancaster Ave. Philadelphia Armory |
| Abington Township High School |
| Academia Pomeroy Covered Bridge |
| Academy Hall |
| Academy of Music |
| Adairs Covered Bridge |
| Adams County Courthouse |
| Adelphi School |
| Ajax Metal Company Plant |
| Albion Carpet Mill |
| Albright Memorial Building |
| Aline Covered Bridge |
| Allegheny Aqueduct |
| Allegheny Baptist Church |
| Allegheny Cemetery |
| Allegheny Furnace |
| Allegheny High School |
| Allegheny Observatory |
| Allegheny Portage Railroad National Historic Site |
| Allegheny River Locka and Dam No. 5 |
| Allegheny River Lock and Dam No. 2 |
| Allegheny River Lock and Dam No. 3 |
| Allegheny River Lock and Dam No. 4 |
| Allegheny River Lock and Dam No. 6 |
| Allegheny River Lock and Dam No. 7 |
| Allegheny River Lock and Dam No.8 |
| Allegheny River Lock and Dam No. 9 |
| Allegheny West Historic District |
| Allentown Masonic Temple |
| Allentown National Bank |
| Allerdice, Taylor, High School |
| Allgates |
| Alliance Furnace |
| Altoona Armory |
| Amalgamated Center |
| Ambridge Commercial Historic District |
| American/Consolidated Tobacco Companies |
| American Philosophical Society Hall |
| Andrews Bridge Historic District |
| Andrews, H. O., Feed Mill |
| Angle Farm |
| Annville Historic District |
| Antes, Henry, House |
| Anthracite Bank Building |
| Arch Street Friends Meeting House |
| Arch Street Opera House |
| Armstrong Cork Company |
| Armstrong County Courthouse and Jail |
| Armstrong Tunnel |
| Arsenal Junior High School |
| Ashley and Bailey Company Silk Mill |
| Ashley and Bailey Silk Mill |
| Ashley Planes |
| Askew Bridge |
| Athenaeum of Philadelphia |
| Athens Historic District |
| Atkinson, Clement, Memorial Hospital |
| August, Wendell, Forge |
| Austin Dam |
| Awbury Historic District |
| Ayres, John, House |
| Bache, Alexander Dallas, School |
| Bachman and Forry Tobacco Warehouse |
| Bahr Mill Complex |
| Bailey Covered Bridge |
| Bailey, John, Farm |
| Bair, Oliver, H., Funeral Home |
| Banks Covered Bridge |
| Baptist Institute for Christian Workers |
| Barclay House |
| Barley Sheaf Inn |
| BARNEGAT (lightship) |
| Barree Forge and Furnace |
| Barrett, Rufus, Stone House |
| Barronvale Bridge |
| Bartram, John, High School |
| Bartram's Covered Bridge |
| Basch & Fisher Tobacco Warehouse |
| Baumgardner's Mill Covered Bridge |
| Bausman Farmstead |
| Baxter High School |
| Bayard School |
| Beallsville Historic District |
| Bear Creek Village Historic District |
| Beatty's Mills Factory Building |
| Beaver Historic District |
| Bedford County Alms House |
| Bedford Historic District |
| Bedford School |
| Bedford Springs Hotel Historic District |
| Beeber, Dimner, Junior High School |
| Beechdale Bridge |
| Beechwood Elementary School |
| Beggarstown School |
| Bellefonte Armory |
| Bellefonte Forge House |
| Bellevue Stratford Hotel |
| Bell, John C., House |
| Bells Mills Covered Bridge |
Data from United States Park Service and Wikidata
