Institution
- Chester County Historical Society Archives699
- Chester County Historical Society Archives (S.C.)4,352
- Chester County Historical Society. Chester County (S.C.)204
- Chester Historical Society. Chester County (S.C.)501
- Chesterfield County Library System307
- Chesterfield County Library, Matheson Memorial Library153
- Chicago Flexible Shaft Company1
- Chicken of the Sea2
- Chr. Hansen's Laboratory, Inc.;The Junket Folks1
- Church & Dwight Co., Inc.2
- City of Charleston229
- City of Columbia3
- City of Columbia (S.C.)7
- City of Mullins, South Carolina740
- Clemson University Arthropod Collection1,124
- Clemson University Libraries20,436
- Clemson University Libraries Special Collections and Archives175
- Clemson University Libraries. Special Collections and Archives88
- Coastal Carolina Universitiy1
- Coastal Carolina University2,549