- Pet Milk Co.1
- Pet Milk Company3
- Philadelphia Inter-State Dairy Council, Philadelphia, Pennsylvania1
- Piggly Wiggly Bird Co.1
- Pillsbury Food Products, Minneapolis, Minnesota1
- Plant Flour Mills Co., St. Louis, Missouri1
- Planters1
- Plymouth Rock, New York
1
- Portable Kitchens Division of Hamlin Products, Inc.1
- Poultry & Egg National Board1
- Presbyterian College60
- Prince Golden1
- Private Collection1
- Producers Creamery Company1
- Quaker Oats1
- Quality Press, Milwaukee1
- R. B. Davis Company1
- R. U. Delapenha & Co., Inc.1
- Rath's Black Hawk1
- Rawleigh1