Names
- Cleveland-Cliffs Iron Company.2
- Clisbee, Charles West, 1833-1889.1
- Cobbs & Mitchell.2
- Codd, George Pierre, 1869-1927.1
- Coleman, John Strider, 1897-1958.1
- Columbus, Chicago and Indiana Central Railway Company.1
- Comstock, William Alfred, 1877-1949.4
- Conger, Ivan.1
- Conrad, E. S.1
- Cooley, Mortimer E. (Mortimer Elwyn), 1855-1944.3
- Cooley, Mortimer Elwyn, 1855-1944.1
- Coolidge, Calvin, 1872-1933.2
- Coolidge, Grace Goodhue, 1879-1957.1
- Copeland Royal Samuel, 1868-1938.1
- Copeland, Royal S. (Royal Samuel), 1868-1938.1
- Costello, Lou.1
- Cotter, William Edward, 1893-1957.1
- Couzens, James Joseph, 1872-1936.1
- Couzens, James, 1872-1936.4
- Cramton, Louis C. (Louis Convers), 1875-3