All - Constructed - 1920–1929
| Peirce, Edward, House-Henderson House of Northeastern University |
| Pelham Picture House |
| Penland School Historic District |
| Penn Alto Hotel |
| Pennington County Courthouse |
| Percha Creek Bridge |
| Pere Marquette Hotel |
| Perth Amboy Station |
| Peter Nelson Cabin Site |
| Petersburg National Battlefield |
| Peyser Building-Security Savings and Commercial Bank |
| Phillips, Harriet, Bungalow |
| Philtower |
| Physicians Building |
| Pickwick Theater Building |
| Pierce Pennant Motor Hotel |
| Pierpont Morgan Library |
| Pike, Albert, Hotel |
| Pike, LeRoy F., Memorial Building |
| Pilgrim and Puritan Apartment Complex |
| Pillsbury Mountain Forest Fire Observation Station |
| Pincolini Hotel |
| Pine Bluffs High School |
| Pine Grove Community House |
| Pine Street Creamery, (Former) |
| Pipe Spring National Monument |
| Plainfield Masonic Temple |
| Plaisance School |
| Platte County Courthouse |
| Players, The |
| Playland Amusement Park |
| Plaza del Mercado de Manati |
| Pleasant Inn |
| Plummer Memorial Library |
| Plymouth Theater |
| Poe Reef Light Station |
| Poile Zedek Synagogue |
| Poinsetta Apartments |
| Point Vicente Light |
| Pokagon State Park |
| Polk Theatre and Office Building |
| Pomander Walk District |
| Pope Brace Company Building |
| Portia Club |
| Port Washington Fire Engine House |
| Posey, John V. G., House |
| Pottawatomie County Fair Pavilion |
| Poydras High School |
| Presby Memorial Iris Gardens Horticultural Center |
| President Hotel |
| Prince Charles Hotel |
| Proctor, F. F., Theatre and Arcade |
| Produce Terminal Cold Storage Company Building |
| Professional Building |
| Professional Building |
| Promised Land |
| Promontory Butte Lookout Complex |
| Prospect House |
| Providence-Biltmore Hotel |
| Provine Service Station |
| Prowers County Building |
| Pryor Creek Bridge |
| Public Service Building |
| Public Service Building and Garage |
| Puerto Rico Ilustrado-Edificio El Mundo |
| Pulver Brothers Filling Station |
| Purdy, Willard D., Junior High and Vocational School |
| Purple Point-Stehekin Ranger Station House |
| Pyle, Glenn O. and Lucy O., House |
| Pythian Castle Lodge |
| Queensbury Hotel, The |
| Quincy Police Station |
| Quinlan Castle |
| Rahrer, Francis, House |
| Rahway Theatre |
| Raleigh, Sir Walter, Hotel |
| Ramona Theater |
| Rand Tower |
| Rangers' Club |
| Ranger's Dormitory |
| Rapid City High School |
| Rapid City Masonic Temple |
| Raymond Park Apartments |
| Raynolds, Sara, Hall |
| Read House |
| Reading Railroad Pottstown Station |
| Reakirt Building |
| Reay Boathouse |
| Redfield City Hall, Old |
| Redford Theatre Building |
| Red Hill Fire Observation Station |
| Red Lodge Communal Mausoleum |
| Redmond City Park |
| Reeds Peak Lookout Tower |
| Refreshment Pavillion |
| Reid's Grove School |
| Reidsville High School, Former |
| Renner Ball Park |
| Renshaw, Alfred, House |
| Reynolds Building |
Data from United States Park Service and Wikidata
