- Cavalry and Light Artillery School4
- Censorship Office16
- Censure Charges, Select Committee To Study, Senate3
- Census36
- Census Bureau28,340
- Census Bureau (Commerce and Labor Department)87
- Census Committee88
- Census Committee (Senate)1
- Census Committee, House39
- Census Office98
- Census of Partial Employment, Unemployment, and Occupations56
- Census, 12th, Select Committee on2
- Census, 1940 (16th)1
- Census, Bureau of the46
- Census, Committee on the9
- Centennial of Establishment of Seat of Government in Washington, Committee on2
- Centennial of Louisiana Purchase, Special Committee on3
- Center for Disease Control101
- Central Department1
- Central Housing Committee95