- Pearson, Robert Carl, 1926-1
- Plummer, Henry G.1
- Poland, Edwin C.1
- Poole Brothers1
- Puget Mill Company. Real Estate Dept1
- Rand McNally and Company, cartographer1
- Rand McNally and Company, cartographer, publisher1
- Rankine, John W.1
- Rice, William1
- Richardson, Donald, 1925-1
- Rockwell, W. L.1
- Russell, Hugh1
- Seattle and Lake Washington Waterway Company1
- Sievers & Duecy, publisher1
- Smith, Mackey1
- Swan, Charles H.1
- Swanson, Donald A. (Donald Alan), 1938-1
- Tabor, R. W. (Rowland W.)1
- Thomson & White, cartographer1
- Trimble, Donald E.1
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