- Pearson, Paul M.1
- Peck, Eva W.1
- Peid, G. Franklin1
- Peters, Richard, Jr.1
- Pounsford, Harry G.1
- Powers, Jessie1
- Pratt, George D.1
- Price, Theodore H. (Theodore Hazeltine), 1861-19351
- Proctor, Charles M.1
- Pullman Company1
- Purina Mills1
- Purves, Ellen W.1
- R. Fulton Cutting1
- R., B. W.1
- Ractz, E. M., Mrs.1
- Ranck, Paul1
- Rankin, Hugh1
- Rankin, Hugh, Mrs.1
- Reed, C. Lawson, Mrs.1
- Reed, Mabel Loomis1
