- California Débris Commission (Engineer Department, War Department)2
- California, Department of11
- California, Department of (War Department)1
- Callaway, Oscar, Special Committee to Report on Expunging From Congressional Record Certain Language of1
- Campaign Expenditures, 1946, Special Committee to Investigate, House2
- Campaign Expenditures, 1952, Special Committee to Investigate, House2
- Campaign Expenditures, 1958, Special Committee to Investigate1
- Campaign Expenditures, 1960, Special Committee to Investigate1
- Campaign Expenditures, Select Committee to Investigate, House1
- Campaign Expenditures, Special Committee on1
- Campaign Expenditures, Special Committee to Investigate4
- Campaign Expenditures, Special Committee to Investigate, House10
- Canadian Boundary Delimitation Commission1
- Canal Zone Biological Area1
- Canal Zone Government105
- Canal Zone Isthmus of Panama216
- Canal Zone, Isthmus of Panama (Isthmian Canal Commission, War Department)23
- Capital Issues Committee5
- Capitol Building and Grounds Superintendent25
- Capitol Building and Grounds Superintendent (Interior Department)3