All - Architectural style - Neoclassical architecture
| Pocahontas County Courthouse |
| Pocahontas Fuel Company Store |
| Pocahontas Fuel Company Store and Office Buildings |
| Poinsett County Courthouse |
| Point Robinson Light Station |
| Police Station No. 2 |
| Police Station No. 3 |
| Polish Roman Catholic Union of America |
| Polk County Courthouse and 1905 Courthouse Annex |
| Polk County Courthouse, Old |
| Polo Independent Order of Odd Fellows Lodge No. 197 |
| Pomona High School, Former |
| Pomona YMCA Building |
| Pompeiian Villa |
| Ponce High School |
| Ponder, Abraham Russell, House |
| Porcher House |
| Portal State Bank |
| Port Clinton City Hall |
| Port Costa School |
| Porter, Thomas V., House |
| Portland High School |
| Portland Sanitarium Nurses' Quarters |
| Post Chapel, Fort Sam Houston |
| Post Office Building |
| Post Office Building, Old |
| Post, William, Mansion |
| Potsdam Civic Center Complex |
| Potsdam State Normal School Campus |
| Potter County Courthouse |
| Poughkeepsie Savings Bank |
| Powe House |
| Powell, Benjamin T., House |
| Power and Baird, Wholesale Dry Goods and Notions |
| Power County Courthouse |
| Poydras High School |
| Pratt School |
| President's House, Marion Institute |
| President's Mansion, Old |
| Presidio |
| Preston Court Apartments |
| Preston Hall |
| Price Memorial Hall |
| Price/Wheeler House |
| Prince Hall Masonic Temple |
| Principia Page-Park YMCA Gymnasium |
| Prindle, William, Livery Stable |
| Proctor, John C., Recreation Center |
| Proctor's Theater |
| Proctor-Vandenberge House |
| Providence Methodist Church |
| Providence Street Firehouse |
| Provo Tabernacle |
| Prowers County Building |
| Publicity Building, The |
| Public Market |
| Public School No. 13 |
| Public Sevice Building |
| Pugh House |
| Pulaski County Courthouse |
| Purinton House |
| Putnam County Courthouse |
| Putnam, Thomas Nichols, House |
| Puunene School |
| Quarters 1, Yerba Buena Island, Naval Training Station |
| Quarters Number 1 |
| Queen Anne High School |
| Quincy Police Station |
| Quincy Savings Bank |
| Quincy Woman's Club |
| Racine Depot |
| Racine Elks Club, Lodge No. 252 |
| Radding Building |
| Rains County Courthouse |
| Raleigh Banking and Trust Company Building |
| Ramsay |
| Ramsdell Public Library |
| Randolph County Courthouse |
| Rangeley Trust Company Building |
| Rankin Building |
| Raphael House |
| Ravalli County Courthouse |
| Ray Apartments Buildings |
| Rayburn, Sam, Library and Museum |
| Ray County Courthouse |
| Ray, Mary, Memorial School |
| Reaney, Margaret, Memorial Library |
| Rector Waterworks Building |
| Red House Presbyterian Church |
| Redlands Hotel |
| Red Willow County Courthouse |
| Reidsville High School, Former |
| Rembert, Frank Taylor and Kate Womack, House |
| Remick, Joseph, House |
| Render Family Homestead |
| Reno National Bank-First Interstate Bank |
| Renwick, Helen Goodwin, House |
| Repton |
| Reserve Loan Life Insurance Company |
| Residence Lopez |
Data from United States Park Service and Wikidata
