Pennsylvania - Criteria: A (event)
| Nitre Hall |
| Noble, J. L. School |
| Noon, Philip, House |
| North Broad Street Station, Reading Company |
| Northbrook Historic District |
| North East Historic District |
| Northeast Manual Training School |
| Northern Liberties Historic District |
| Northern National Bank |
| North Hill Historic District |
| North Oriental Covered Bridge |
| North Prince Street Historic District |
| North Scranton Junior High School |
| Northumberland County Courthouse |
| North Warwick Historic and Archeological District |
| Northwest York Historic District |
| Noxen School |
| N. Shippen-Tobacco Avenue Historic District |
| Nugent Home for Baptists |
| Nyce Farm |
| Oakdale |
| Oakdale Public School |
| Oakmont Country Club Historic District |
| O'Connor, J.S., American Rich Cut Glassware Factory |
| Octagon Stone Schoolhouse |
| Oil City Armory |
| Oil City Downtown Commercial Historic District |
| Oil City North Side Historic District |
| Oil City South Side Historic District |
| Okehocking Historic District |
| Old Brown's Mill School |
| Old City Hall |
| Old City Historic District |
| Old Columbia-Wrightsville Bridge |
| Old Conemaugh Borough Historic District |
| Old Customshouse |
| Old Downtown Harrisburg Commercial Historic District |
| Old Dry Road |
| Old Economy |
| Old Federal Reserve Bank |
| Old Germantown Academy And Headmasters' Houses |
| Old Hannastown, Site of |
| Old Hoopes School |
| Old Indiana County Courthouse |
| Old Indiana County Jail and Sheriff's Office |
| Old Kennett Meetinghouse |
| Old Lehigh County Courthouse |
| Old Main |
| Old Main and Chemistry Building |
| Old Main, Goethean Hall, and Diagnothian Hall |
| Old Mauch Chunk Historic District |
| Old Norriton Presbyterian Church |
| Old Pottstown Historic District |
| Old Rose Tree Tavern |
| Old Swede's House |
| Old Union County Courthouse |
| Old Waterworks |
| Old White Mill |
| Oley Township Historic District |
| Oliver, David P., High School |
| Oregon Mill Complex |
| Orthodox Meetinghouse |
| Osterburg Covered Bridge |
| Overbrook Farms |
| Oxford Hotel |
| Packsaddle Bridge |
| Packwood House-American Hotel |
| Palmerton Historic District |
| Paoli Battlefield Site and Parade Grounds |
| Paradise Furnace |
| Paradise Valley Historic District |
| Parker Dam State Park Family Cabin District |
| Parker Dam State Park-Octagonal Lodge |
| Parker Dam State Park-Parker Dam District |
| Parker's Ford |
| Parkersville Friends Meetinghouse |
| Parkesburg School |
| Parkinson, Robert, Farm |
| Park Towne Place |
| Parr's Mill Covered Bridge No. 10 |
| Passenger Locomotive No. 1223 |
| Passenger Locomotive No. 1737 |
| Passenger Locomotive No. 460 |
| Patriotic Order Sons of America Washington Camp 422 |
| Patterson Covered Bridge No. 112 |
| Patton Historic District |
| Pawling, Isaac, House |
| Paxson, Isaiah, Farm |
| Peace Church |
| Pembroke Village Historic District |
| Penn Alto Hotel |
| Penn-Craft Historic District |
| Pennock, Martha, House |
| Pennsalt Historic District |
| Pennsbury Inn |
| Penn's Cave and Hotel |
| Penn's Park General Store Complex |
| Penns Park Historic District |
| Pennsylvania Canal and Limestone Run Aqueduct |
| Pennsylvania Canal Guard Lock and Feeder Dam, Raystown Branch |
Data from United States Park Service and Wikidata
