All - Constructed - 1870–1879
| Old Jacksonville Free Public Library |
| Old McDonald County Courthouse |
| Old Oxford Mill |
| Old Peabody Library |
| Old Petaluma Opera House |
| Old Santa Rosa Catholic Church and Cemetery |
| Old Scotch Church |
| Old South Church in Boston |
| Old St. Patrick's Church |
| Old U.S. Mint |
| Old Volcano House No. 42 |
| Old Yaquina Bay Lighthouse |
| Olsen, Hans Peter, House |
| Ophir Town Hall |
| Orchard Lake Schools Historic District |
| Oregon Pacific Railroad Linear Historic District |
| Ormsby-Kelly House |
| Osage Mission Infirmary |
| Osceola Masonic Block |
| Oshtemo Town Hall |
| Ott, John George, House |
| Our Lady of Mt. Carmel Church |
| Overackers Corners Schoolhouse |
| Paddock, Augustus, House |
| Palacio del Marques de las Claras |
| Palmer, Albert, House |
| Palos Covered Bridge |
| Paradise School |
| Paradise Tithing Office |
| Parker-Burnett House |
| Parsons, Edward, House |
| Partridge, Edward and Elizabeth, House |
| Passolt House |
| Payne-Gentry House |
| Penfield Reef Lighthouse |
| Pennell Institute |
| Pepin County Courthouse and Jail |
| Perrigo-Holmes House |
| Perry, T. B., House |
| Peterson, Peter, House |
| Philbrook, Samuel D., House |
| Pickens County Courthouse |
| Piedras Blancas Light Station |
| Pierce House |
| Pierce, Sylvester K., House |
| Piermont Railroad Station |
| Pillsbury Academy Campus Historic District |
| Pinkham House |
| Pioneer Register |
| Piper, Daniel S., House |
| Platt, Jeremiah, House |
| Pleasant Valley School |
| Ploger-Moneymaker Place |
| Plymouth Congregational Church |
| Point Arena Light Station |
| Point Fermin Lighthouse |
| Point Montara Light Station |
| Point No Point Light Station |
| Point of Rocks Railroad Station |
| Point Reyes Light Station |
| Point Wilson Lighthouse |
| Pollock, Jackson, House and Studio |
| Pomham Rocks Light Station |
| Ponn Humpback Covered Bridge |
| Pope, Capt. John S., Farm |
| Portage Canal |
| Port Austin Reef Light |
| Porter-Parsonfield Bridge |
| Post Trader's Store and Riallito House |
| Potter, Judge Joseph, House |
| Potter's Covered Bridge |
| Poulsen-Hall House |
| Poverty Island Light Station |
| Prairie Grove School |
| Pratt, John Fenton, Ranch |
| Prentiss, Addison, House |
| Presbyterian Mission Church |
| Presque Isle Light |
| Presque Isle Light Station |
| Price Villa |
| Proctor, William, House |
| Providence City Hall |
| Provincetown Public Library |
| Public School 39 |
| Public School 65K |
| Purnell, James C., House |
| Quackenbush Pumping Station, Albany Water Works |
| Quarry Limekiln |
| Race Rock Light Station |
| Railway Exchange Building and Huber's Restaurant |
| Rasmussen, Morten, House |
| Raven Rock Road Bridge |
| Raymond, P. P., House |
| Reading Railroad Passenger Station-Tamaqua |
| Rear Lighthouse of Hilton Head Range Light Station |
| Reber, Frederick and Anna Maria, House |
| Reckless, Anthony, Estate |
| Red Top |
| Reed School |
| Reservoir No. 3 |
Data from United States Park Service and Wikidata
