| Y 3.P 11 | Pacific Railway Commission (1887) |
| Y 3.P 11/2 | Pacific Southwest Inter-Agency Committee (1955) |
| Y 3.P 11/3 | Pacific Southwest Federal Interagency Technical Committee (?-1955) |
| Y 3.P 11/4 | Pacific Northwest River Basins Commission (1967-1981) |
| Y 3.P 11/5 | Pacific Northwest Regional Commission (1976-1981) |
| Y 3.P 19 | Commission on Federal Paperwork (1974-1978) |
| Y 3.P 19/2 | Panama Canal Commission (1979-1999) |
| Y 3.P 29 | Prospective Payment Assessment Commission (1983-1997) |
| Y 3.P 31 | United States Institute of Peace (1984- ) |
| Y 3.P 38 | Pennsylvania Avenue Development Corporation (1972- 1996) |
| Y 3.P 38/2 | Pension Benefit Guaranty Corporation (1974- ) |
| Y 3.P 43 | Federal working Group on Pest Management (1974-1981) |
| Y 3.P 43/2 | Advisory Council on Intergovernmental Personnel Policy (1973-1974) |
| Y 3.P 44 | Petroleum Administration for War (1942-1946) |
| Y 3.P 53 | Philippine Commission (1899-1900) |
| Y 3.P 53/2 | Philippine War Damage Commission (1946-1951) |
| Y 3.P 56 | Physician Payment Review Commission (1986-1997) |
| Y 3.P 74 | Joint Commission on Government Purchases of Pneumatic Tubes (1912-1914) |
| Y 3.P 74/2 | Joint Commission on Pneumatic Tube Mail Service (1917) |
| Y 3.P 75 | Commission on Political Activity of Government Personnel (1966-1967) |
| Y 3.P 81 | Commission on Population Growth and the American Future (1970) |
| Y 3.P 81/2 | National Commission for the Observation of World Population Year (1974) |
| Y 3.P 83 | Porto Rico Laws Commission (1901) |
| Y 3.P 84/1 | Commission to Investigate the Postal Service (1898-1901) |
| Y 3.P 84/2 | Postal Commission (1906-1907) |
| Y 3.P 84/3 | Joint Commission on the Postal Service (1920) |
| Y 3.P 84/4 | Postal Regulatory Commission (1970- ) |
| Y 3.P 84/5 | Commission on Postal Service (1976-1977) |
| Y 3.P 92 | President’s Organization on Unemployment Relief (1931-1932( |
| Y 3.P 92/2 | President’s Committee on Crop Insurance (1936) |
| Y 3.P 92/3 | President’s Committee on Administrative Management (1936-1937) |
| Y 3.P 92/4 | President’s Committee on Civil Service Improvement (1939-1941) |
| Y 3.P 92/5 | President’s Committee on Religious and Moral Welfare and President’s Committee on Religion and Welfare in the Armed Forces (1949-1951) |
| Y 3.P 92/6 | Presidential Commission on Catastrophic Nuclear Accidents (1988-1991) |
| Y 3.P 93 | Printing Investigation Commission (1905-1907) |
| Y 3.P 93/2 | Priority in Transportation Commissioner (1917) |
| Y 3.P 93/3 | Prison Industries Reorganization Administration (1935-1940) |
| Y 3.P 93/4 | Price Commission (1971-1973) |
| Y 3.P 93/5 | Privacy Protection Study Commission (1974) |
| Y 3.P 94 | National Center for Productivity and Quality of Working Life (1977- 1978) |
| Y 3.P 96/1 | Public Land Commission (1879-1880) |
| Y 3.P 96/2 | Public Lands Commission (1903-1905) |
| Y 3.P 96/3 | Committee on Public Information (1917-1919) |
| Y 3.P 96/4 | Public Buildings Commission (1919-1933) |
| Y 3.P 96/5 | Commission on the Conservation and Administration of the Public Domain (1930-1931) |
| Y 3.P 96/6 | Publications Board (1945) |
| Y 3.P 96/7 | Public Land Law Review Commission (1964-1970) |
| Y 3.P 96/8 | National Council on Public Works Improvement (1984-1988) |
| Y 3.P 96/9 | National Commission on Severely Distressed Public Housing (1989-1993) |
| Y 3.P 97 | Committee for Purchase from People Who Are Blind or Severely Disabled, operating as the U.S. AbilityOne Commission (1971-1974, 1993- ) |
