Names
- Clark, John Bates, 1847-1938.1
- Clements, William L. (William Lawrence), 1861-1934.1
- Cleveland and Pittsburgh Railroad Company1
- Cleveland, Cincinnati, Chicago, and St. Louis Railway Company.2
- Cleveland-Cliffs Iron Company.1
- Cobbs & Mitchell.1
- Colorado and Southern Railway.1
- Columbus, Chicago and Indiana Central Railway Company.1
- Commons, John Rogers, 1862-1945.1
- Conant, Charles A. (Charles Arthur), 1861-1915.1
- Cooley, Charles Horton, 1864-1929.1
- Cooley, Lyman Edgar, 1850-1917.1
- Cooley, Mortimer E. (Mortimer Elwyn), 1855-1944.1
- Cooley, Thomas McIntyre, 1824-1898.1
- Cornell University1
- Crawford and Manistee River Railway Company.1
- Cummer Lumber Company.1
- Cummer Sons Cypress Company.1
- Cummer-Diggins Company.1
- Cutler & Savidge Lumber Company.1