- Jacks
- Janitor Service
- Janitors' Equipment & Supplies
- Japanese Food Products
- Jewelers' Equipment & Supplies
- Jewelers' Supplies & Findings
- Jewelers-Manufacturers
- Jewelers-Retail
- Jewelers-Wholesale
- Jewelry Boxes
- Jewelry Buyers
- Jewelry Designers
- Jewelry Enamelers
- Jewelry Engravers & Castings
- Jewelry Repairing
- Judo, Karate & Jiu Jitsu Instruction
- Junk Dealers
- Juristic Person Management
- Jute (Kenaf)
