- Sanborn (Firm)2
- Sanson, Nicolas2
- Santini, Francesco.2
- Santini, P. (Paolo)2
- Sardeson, Frederik W.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
- Senate2
- Setterson, Dale R.2
- Seven Years' War (1756-1763)2
- Sewall, Joseph S. (1827-1917)2
- Shaw, Clifford R. (Clifford Robe), 1895-19572
- Sheafer, P. W. (Peter Wenrick), 1819-2
- Sherman & Smith2
- Sherman, Fred D.2
- Simerl, R. A.2