All - Constructed - 1890–1899
| Ouray City Hall and Walsh Library |
| Our Lady of Sorrows Chapel |
| Overcarsh House |
| Overstreet House |
| Owen, Dr. Thomas McAdory, House |
| Oxford Hotel |
| Oxford, The |
| Pabst, Frederick and Maria, House |
| Pabst Theater |
| Pacific National Bank Building |
| Packard, Moses, House |
| Packer's National Bank Building |
| Palmer Memorial Hall |
| Parberry Block East |
| Park East Synagogue, Congregation Zichron Ephraim |
| Parker 13-Sided Barn |
| Parker, Joseph William, Farm |
| Park Front |
| Park Hill |
| Park Row Building |
| Parks's Gap Bridge |
| Park Street Railroad Station |
| Park Street School |
| Parmley, Mary Ellen, House |
| Parthenon, The |
| Patin House |
| Patterson, Charles, House |
| Patton, Augustus B., House |
| Pawtucket Congregational Church |
| Peabody, Elizabeth, School |
| Peabody Institute |
| Peabody, The |
| Peabody-Williams House |
| Pearsons Hall of Science |
| Pebble Hill Plantation |
| Peeples, Hattie J., House |
| Peirce, John, House |
| Peirce School |
| Pennsylvania Match Company |
| Perkins Island Light Station |
| Perrigo, George, House |
| Peyton Building and Peyton Annex |
| Philler Cottage |
| Phillips, Duncan, House |
| Phillips, John Archibald, House |
| Phipps Conservatory |
| Phoenix Indian School Historic District |
| Phoenix Union High School Historic District |
| Pi Chapter House of Psi Upsilon Fraternity |
| Piedmont Park |
| Pierce County Jail |
| Pilgrim Congregational Church |
| Pilgrim Memorial Church and Parish House |
| Pillsbury Memorial Hall |
| Pincus Building |
| Pine Creek Irrigation Canal |
| Pine Tree Lumber Company Office Building |
| Pitkin County Courthouse |
| Pittsfield Universalist Church |
| Plaquemine High School |
| Plaza Hotel |
| Pleasant Ridge Church |
| Pleasant Street School |
| Plum Beach Lighthouse |
| Plum Island Range Rear Light |
| Plummer, Amos and Lillie, House |
| Poindexter, H. D., Houses |
| Polk County Courthouse |
| Pollard Block |
| Pond, Florence and John R., House |
| Pontiac Building |
| Port, Dr. Luke A., House |
| Porter County Memorial Hall |
| Porter, Walworth D., Duplex Residence |
| Portillo, Mauricio, House |
| Portland City Hall |
| Portsmouth Fire Department No. 1 |
| Powell House |
| Prague Hotel |
| Prairie du Chien City Hall |
| Prentiss, Frederick, House |
| Prentiss-Tulford House |
| Presbyterian Church at Bound Brook |
| President's Cottage |
| Price's Mill |
| Priestly's Hydraulic Ram |
| Prospect Hill School |
| Providence Street Firehouse |
| Prudential Building |
| Public School 108 |
| Public School No. 60 |
| Pullman High School |
| Putnam, Israel, Wolf Den |
| Pyle House |
| Pythian Opera House |
| Quarles, W. J., House and Cottage |
| Quarters 1, Fort Myer |
| Quinn Chapel of the A.M.E. Church |
| Quitman County Courthouse and Old Jail |
| Rademacher, Frank J., House |
Data from United States Park Service and Wikidata
