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- Mitchell, S. Augustus (Samuel Augustus), 1792-1868, cartographer.1
- Morawski, P. S. http://id.loc.gov/authorities/names/n2008034777 http://viaf.org/viaf/19402001
- National Railway Publication Company1
- Neill, N. P. (Nelson Prentice)1
- Nozaki, Sabun, 1858-19351
- O.W. Gray & Son1
- Ohman Map Co.1
- Orahood, C. H. (Charley Harold),1882-cartographer.1
- Oregon Railway and Navigation Company1
- Osborn, Chase S. (Chase Salmon), 1860-19491
- Ottawa. Geological Survey Department, surveyor.1
- Ottens, J. (Josua), 1704-17651
- Ottens, R. (Reinier), 1698-17501
- Ozaki, Tomigorō.1
- Paige, Wm. Robert1
- Peck, John Mason, 1789-18581
- Penson, S.R.G.1
- Picquet, Charles, 1771-1827.1
- Poole Brothers1