- Cadell, T. (Thomas), 1773-18361
- Cady & Burgess1
- Carey & Lea1
- Charles E. Merill Co. 1
- Chemnitz, Druck von J.C.F. Pickenhahn, 18771
- Christopher Sower Company1
- Cincinnati (Ohio). Department of Public Works1
- Cincinnati Art Museum1
- Cincinnati Children's Hospital Medical Center1
- Cincinnatus Association1
- City of Boston1
- Clark & Hesser1
- College of Design, Architecture, Art and Planning1
- Collins & Brother1
- Collins Printing House1
- Collins, Perkins & Co.1
- Collins, R. B.1
- Colman, Samuel, 1799-1
- Columbia University1
- Copp Clark Company1