Institution
- Oak Farms1
- Occident Flour1
- Oconee County Public Library10
- Old Exchange and Provost Dungeon Museum, Charleston, S.C.1
- Oleomargarine1
- Omega1
- Oriental1
- P. Co., Inc.1
- Parkay;Kraft Cheese Company1
- Parowax1
- Patriots Point Naval and Maritime Museum839
- Pawleys Island Civic Association436
- Penick & Ford Ltd., Incorporated1
- Perfection Stove Company1
- Pet Milk6
- Pet Milk Co.1
- Pet Milk Company3
- Philadelphia Inter-State Dairy Council, Philadelphia, Pennsylvania1
- Piggly Wiggly Bird Co.1
- Pillsbury Flour Mills Co.1