- Ice
- Ice Cream & Frozen Desserts-Dealers
- Ice Cream & Frozen Desserts-Manufacturers & Distributors
- Ice Cream Cones
- Ice Cream Manufacturers' Equipment & Supplies
- Ice Cream Mixes
- Ice Making Equipment & Machines
- Identification Equipment & Supplies
- Identification Service
- Imitation Jewelery
- Importer-Service
- Importers
- Incense-Raw Materials
- Incense-Wholesale
- Incense-Wholesale & Manufacturers
- Incinerators
- Industrial Consultants
- Industrial Equipment & Supplies
- Industrial Flour
- Industrial Instruments
- Industrial Plants-Engineers & Contractors
- Industrial Real Estate Developers
- Industrial-Control Equipment & System-Installation
- Inflatable Boats
- Inks-Manufacturers' Materials
- Inks-Printing & Lithographing
- Inks-Writing & Marking
- Insect Control Devices
- Insecticides
- Inspection Bureaus
- Insulation
- Insulation Applying Machinery
- Insulation Contractors
- Insulation Contractors-Home & Building
- Insulation Contractors-Industrial
- Insulation Materials-Cold & Heat
- Insurance
- Insurance Brokers & Consultants
- Insurance-Health
- Interior Decorators
- Interior Decorators & Designers
- Interior Decorators' Supplies
- International Call-Service Provider
- International School
- Internet & Intranet Services
- Internet Shop
- Internet-Web Page Design & /or Programming
- Investigators & Detective Agencies
- Investigators-Equipment-Import & Dealers
- Investment Advisory Service
- Iron
- Iron Compressors Machines
- Iron Ornamental Works
- Irrigation Systems & Equipment
- Italian Food Products
- Ivory Products
