- Canned Salmon Industry1
- Carl Sandburg Home National Historic Site14
- Carnation Company1
- Carnation Milk3
- Catholic Diocese of Charleston Archives710
- Cayce Historical Museum, South Carolina1
- Certo2
- Charles B. Knox Co., Johnstown, New York1
- Charles B. Knox Gelatine Co., Inc1
- Charles B. Knox Gelatine Co., Inc, Johnstown, New York1
- Charles B. Knox Gelatine Co., Inc, Johnstown, New York;1
- Charles B. Knox Gelatine Co., Inc.1
- Charles B. Knox Gelatine Co., Inc., Johnstown, New York, Montreal, Canada1
- Charles Gulden, Inc.1
- Charleston Museum1
- Charleston County Register Mesne Conveyance1
- Charleston Library Society33
- Charleston Museum4
- Charleston Museum, South Carolina2
- Charleston Southern University12