- Philippines Committee16
- Phosphate Resources of United States, Joint Committee to Investigate Adequacy and Use of5
- Pilgrim Tercentenary Celebration Joint Special Committee2
- Pneumatic Tubes, Joint Commission on Government Purchase of4
- Pneumatic-Tube Mail Service Joint Commission1
- Pointing Committee, House1
- Pornographic Materials, Current, Select Committee on, House1
- Post Office Leases Select Committee, Senate4
- Post Office and Civil Service Committee, House129
- Post Office and Civil Service Committee, Senate59
- Post Office and Post Roads Committee426
- Post Office and Post Roads Committee, House434
- Post Office and Post Roads Committee, Senate400
- Post-Office Department and Postal Service, Joint Commission on Business Method of2
- Post-Office Leases Select Committee, Senate1
- Post-Office and Post-Roads Committee93
- Post-War Economic Policy and Planning, Special Committee on, House18
- Post-War Economic Policy and Planning, Special Committee on, Senate16
- Post-War Military Policy, Select Committee on, House5
- Postage on 2d-Class Mail Matter and Compensation for Transportation of Mails, Joint Committee on11