- Mortier, Corneille3
- Morton, Robert H.3
- Münster, Sebastian, 1489-15523
- National Geographic Society (U.S.). Map Department3
- Neill, N. P. (Nelson Prentice)3
- New Jersey Geological Survey (NJGS)3
- New Jersey. State Highway Department3
- Newsom, John F. (John Flesher), 1869-19283
- O. C. Simonds & Co.3
- Ochikochi Dōin, active 17th century3
- Ontario. Department of Crown Lands3
- Ottens, J. (Josua), 1704-17653
- Paine, Paul M. (Paul Mayo), 1869-19553
- Palmer, Thos. W. (Thomas W.)3
- Ptolemy, active 2nd century3
- R.L. Polk & Co.3
- Rapkin, J.3
- Renshawe, J. H. (John Henry), 1852-3
- Robert Sayer and John Bennett (Firm)3
- Sampson, Murdock & Co.3