- Busalacchi Bros.1
- C. A. Mosso Co.1
- C. A. Nordstrom1
- C. U. McClellan Laboratories Corporation1
- Campbell Products, Inc.1
- Campbell Soup Co.1
- Carl Fred Krueger, trading as the Oriental Laboratory, St. Louis, Mo.1
- Carl T. Ridenour1
- Carolina Pepper Association1
- Cecil James Cardwell, trading as Trapper's Remedies, Inc., Weiser, Idaho1
- Cereal Lactic Co., Inc.1
- Charles A. Ainsworth, trading as the Ainsworth Specialty Co., Kansas City, Mo.1
- Charles C. Bennett, trading as the Novelty Peanut Co.1
- Charles G. Haskell & Co.1
- Charles W. Bush, trading as the C. W. Bush Co.1
- Cherokee Creamery, Inc.1
- Chickamauga Producers, Inc.1
- City Chemical Corporation1
- City Chemical Corporation, Jersey City, N. J.1
- Cleveland Druggists Specialties Co.1