- Cram, George Franklin, 1841-19284
- Crosby, John Q. A1
- Curtice & Stateler.1
- Curtice, D. L. (David L.), 1828-19026
- Curtice, David L.3
- Curtiss Northwest Airplane Co.1
- D'Ailly, H. A. H.1
- Davison, C. Wright, 1849-19251
- Davison, C., 1849-19251
- Dennee, Phyllis3
- Derby, George M.1
- Dinsmore, A. F.1
- Dow-Arneson Co.1
- Drapeyron, Ludovic , 1839-19011
- Duluth & Iron Range Railroad Company1
- Duluth (Minn.). Board of Realtors.1
- Dunaway, Horace1
- E.C. Bridgman Maps (Firm)1
- Ely Commercial Club (Ely, Minn.)2
- Emerson, Charles L.1