- Morse, Sidney E. (Sidney Edwards), 1794-18712
- Mossler, J.H2
- Mulford, John C.2
- Mullett, John, 1786-18622
- National Cartographic Center (U.S.)2
- National Railway Publication Company2
- Neill, N. P.(Nelson Prentice), cartographer.2
- Nelson, Willis H. (Willis Howard), 1920-20102
- Nemitz, M.2
- New York (State). State Engineer and Surveyor2
- Newberry, J. S. (John Strong), 1822-18922
- Nichols, J. A.2
- Nicollet, J. N. (Joseph Nicolas), 1786-18432
- North-Western Provinces (India). Superintendent, Grand Trunk Road2
- North-Western Provinces (India). Superintendent, Grand Trunk Road.2
- Nowack, W.K.2
- O'Donoghue, John, 1946-2
- Oakland County Planning Commission (Mich.)2
- Ocean County Board of Chosen Freeholders2
- Olmsted, Frederick Law, 1822-19032