Names
- Clark, Charles P.8
- Clark, Chester A.1
- Clark, George H.1
- Clark, Joseph S.2
- Clark, Wesley K.1
- Clary and Associates2
- Classic Teleproductions3
- Classic Video, Inc.1
- Clausen, Henry C., 1905-19921
- Clay, Lucius D. (Lucius DuBignon), 1897-19783
- Clearinghouse publication1
- Cleary and Associates3
- Cleland, Max, 1942-20211
- Clewell, Edgar Lewis1
- Clifford, Clark M., 1906-19981
- Clinton, Bill, 1946-25
- Clinton, Hillary Rodham4
- Clouse and Associates/ Fremstad Group3
- Coalition of Northeastern Governors (U.S.)2
- Cochran, Thad4
