- Roberts, W. A. (Soil surveyor)2
- Roeser, C. (Charles)2
- Roeser, Charles2
- Rogers, F. Kimball2
- Rominger, Carl Ludwig, 1820-19072
- Royal Geographical Society (Great Britain)2
- Ruger, A.2
- Rutgers University Cartography Laboratory, Department of Geography2
- S. Lewis and Co. (London, England)2
- Sanborn (Firm)2
- Santini, Francesco.2
- Santini, P. (Paolo)2
- Sartine, Antoine de, comte d'Alby, 1729-18012
- Schedler, J. (Joseph)2
- Schedule Rating Office, Engineering Department, Newark, N.J.2
- Schmahl, Julius A. (Julius August), 1867-19552
- Schultz, F. A. (Fredrik A.)2
- Seale, Richard William2
- Sewall, Joseph S. (1827-1917)2
- Shaw, Clifford R. (Clifford Robe), 1895-19572