- Chauchard, Captain1
- Chesapeake and Ohio Railway Company1
- Chester (Pa.). Highway Department1
- Chicago Surface Lines1
- Child, Nathaniel (Cartographer)1
- Chile. Oficina de Mensura de Tierras1
- Christie, Charles1
- City Directory Office (New York)1
- Clark, C. W. (Engineer)1
- Clarke, James, of Newport, I.o.W1
- Clason Map Co1
- Clausen, H. V. (Hans Victor), 1861-19371
- Cleveland, H. W. S. (Horace William Shaler), 1814-19001
- Coávens, Jean1
- Coello, Francisco, 1822-18981
- Colby, Charles Galusha, 1830-1866?1
- Coleman, A. P. (Arthur Philemon), 1852-19391
- Colombia. Oficina de Longitudes y Fronteras1
- Colorado Springs (Colo.). City Engineer's Office1
- Colorado. Bureau of Mines1