Iowa - Role: Building
| Our Savior’s Lutheran Church |
| Outing Club |
| Overland Waterloo Company Building |
| Oversen, Julius and Anine House |
| Page County Courthouse |
| Pahl, Henry, House |
| Paine, Samuel and Mercy, House |
| Painter-Bernatz Mill |
| Palmer, B. J., House |
| Palmyra Methodist Episcopal Church |
| Paradise Block Historic District |
| Paradise Farm |
| Paramount Theater Building |
| Parker House |
| Parker's Opera House |
| Park Hotel |
| Park House Hotel |
| Park Inn Hotel |
| Park Motel |
| Parr, Charles Henry, House |
| Paul-Helen Building |
| Paulsen, Peter J., House |
| Paustian, Henry, House |
| Payne, O. E., House |
| Peak, George B., House |
| Pearson, Franklin, House |
| Pease, Dr. Luther L. and Susette E. (Baker), House |
| Peirce, John, House |
| Pella High School |
| Pella Opera House |
| Peoples Nationals Bank |
| People's Savings Bank |
| Perham House |
| Perkins, Charles W. and Nellie, House |
| Perkins, George and Lola, House |
| Perrigo-Holmes House |
| Perry and Brainard Block |
| Perry Carnegie Library Building |
| Perry, T. B., House |
| Peters' Barber Shop |
| Petersen, Max, House |
| Petersen's, J. H. C., Sons Store |
| Peters, J. C., House |
| Peterson Manufacturing Building |
| Picklum, Frank, House |
| Pierce School No. 13 |
| Pierson-Betts House |
| Pilotburg Church |
| Pilot Knob State Park, Observation Tower (Area 2) |
| Pilot Knob State Park, Picnic Shelter (Area 3) |
| Pine Creek Gristmill |
| Pine Mills German Methodist Episcopal Church |
| Pioneer Implement Company |
| Pioneer Oil Company Filling Station |
| Plagmann Round Barn |
| Plambeck, Joachim, House |
| Plane, Robert R., and Julia L., House |
| Pleasant Grove Community Church and Cemetery |
| Pleasant Grove Presbyterian Church |
| Pleasant Hill School |
| Plum Grove |
| Plymouth County Courthouse |
| Plymouth Place |
| Pocahontas County Courthouse |
| Pohlmann, Elizabeth, House |
| Pohlmann, Henry, House |
| Poldberg, Chris, Farmstead |
| Polk County Courthouse |
| Polygonal Barn, Lincoln Township |
| Polygonal Barn, New Oregon Township |
| Polygonal Barn, Van Buren Township |
| Porter Hall |
| Porter-Rhynsburger House |
| Pottawattamie County Jail |
| Pottawattamie County Sub Courthouse |
| Potter's, E. G., Jasper Flour Mill |
| Potter-Williams House |
| Poweshiek County Courthouse |
| Prairie Center Methodist Episcopal Church and Pleasand Hill Cemetery |
| Prairie Grove School |
| Pratt, A. W., House |
| Presbyterian Church |
| President's Cottage |
| Price, Hiram/Henry Vollmer House |
| Price, Rialto, House |
| Prien Building |
| Priester Building, The |
| Primrose Mill |
| Princess-Sweet Shop |
| Public Library of Des Moines |
| Purdy, Eliphalet W. and Catherine E. Jaquish, House |
| Pyle, Glenn O. and Lucy O., House |
| Quasdorf Blacksmith and Wagon Shop |
| Queen, Hogan and Martha A. Runkle, House |
| Quickel, Jacob, House |
| Radcliff, Willam, House |
| Raible, F. J., House |
| Rambo House |
| Ramsey Building |
| Ranshaw, Samuel and Emma A., House |
Data from United States Park Service and Wikidata
