- 5 Convalescent homes
- 7 Convents
- 2 Conversation
- 2 Convertibles
- 1 Conveying systems
- 2 Conveyors
- 1 Convicts
- 1 Conway Soap Factory
- 1 Cook, Captain James, 1778-1779
- 1 Cook, J. Bank
- 3 Cook, Son & Jenkins
- 3 Cookbooks
- 2 Cooke, T. P. (Thomas Potter), 1786-1864
- 2 Cookery (Starch)
- 1 Cookesley, John Moore
- 3 Cookies
- 1 Cooking baskets
- 6 Cooking utensils
- 4 Cooks
- 16 Cook's World's Ticket Office
- 1 Cooley Oil Works
- 10 Coolidge, John Calvin, Jr., 1872-1933
- 1 Coombs & Stack Lumber Yard
- 1 Cooper & Holt
- 2 Cooper River (N.J.)
- 1 Cooper River Park, New Jersey (park)
- 1 Cooper, James & Bro. Cabinet Ware
- 1 Cooper, Jones, & Cadbury
- 3 Cooper, William E. Barrel Yard
- 1 Cooper, William M., 1811-1880
- 1 Cooperation
- 20 Coopers
- 1 Coote, Charles, 1809-1880
- 1 Cope & Stewardson, 1885-1912, Architect
- 4 Cope & Stewardson, Architects
- 1 Cope, E. D. (Edward Drinker), 1840-1897
- 1 Copenhagen, Denmark
- 1 Cope's Paper Mill
- 5 Copies (derivative objects)
- 3 Copley, John Singleton, 1738-1815
