- Sartain, Samuel, 1830-1906, ruler3
- Sällskapet för Finlands geografi, Helsingfors3
- Scarborough Company3
- Sealing, H. E.3
- Siebert, Selmar, printer3
- Sociedad Geogräfica de Lima3
- Standard Map Company3
- Staples, Chas. F.3
- Stoner, J. J.3
- Sublette, G.W.3
- Suomen Maantieteellinen Seura3
- Ten Thousand Lakes of Minnesota Association3
- Thrasher, Frederic Milton, 1892-19623
- Torres, Juan M3
- Ulrich, H. P. (Herbert Paul), 1904-cartographer.3
- United States. Army. Quartermaster Corps3
- United States. Bureau of Public Roads. Geological Survey (U.S.)3
- United States. Department of the Interior3
- United States. General Land Office.3
- United States. War Department. Corps of Engineers3