- Morrow, A. T.1
- Mossler, J.H.1
- Mudrey, M.G., Jr.1
- Mudrey, Mike G., Jr.1
- Munsch, Andrew1
- Mutual Automobile Association of Minnesota1
- National Highways Association1
- Natural Resources Research Institute1
- Neal, Walter J.1
- Nelson, Carl A. (Cashier of the State Bank of Warren)1
- Nichols, George C.1
- Nicholson, W. L. (Topographer)1
- Nicollet, J. N. (Joseph Nicolas), 1786-18431
- Nordstrand, E.1
- Northern Oil Company1
- Northern Pacific Railway Company. Land Department1
- Nutter, Frank H., 1853-1932.1
- O'Hara and Zeese Civil engineers and Surveyors1
- Ogaard, Louis A.1
- Olesiak, Rachael A1