- Assay Commission (Mint Bureau, Treasury Department)3
- Assistance Payments Administration25
- Assistant Attorney-General1
- Assistant Postmaster-General (First)1
- Assistant Postmaster-General (Second)1
- Assistant Public Printer (Superintendent of Documents)94
- Association of Economic Entomologist1
- Association of Official Agricultural Chemists4
- Astronautics and Space Exploration, Select Committee on3
- Astrophysical Observatory51
- Atlantic-Pacific Interoceanic Canal Study Commission1
- Atomic Energy Commission13,848
- Atomic Energy Joint Committee440
- Atomic Energy, Special Committee on, Senate8
- Attorney General's Committee on Administrative Procedure4
- Attorney General's Committee on Bankruptcy Administration1
- Attorney General, Assistant, for Court of Claims2
- Attorney General, Assistant, for Court of Claims and District Courts10
- Attorney General, Assistant, for Customs Matters9
- Attorney-General, Assistant for Post-office Department1