- Industrial & Commercial Cleaning Services & Companies, Lowell
- Industrial & Commercial Real Estate, Lowell
- Industrial & Heavy Vehicle Dealers, Lowell
- Industrial Contractors, Lowell
- Industrial Equipment & Machinery, Lowell
- Industrial Goods & Products - Hard Goods - Large, Lowell
- Industrial Goods & Products - Hard Goods - Small, Lowell
- Industrial Lifts, Lowell
- Industrial Supply, Parts & Equipment - Miscellaneous, Lowell
- Industrial Trucks, Lowell
- Industry, Lowell
- Information Bureaus & Services, Lowell
- Information Consultants, Lowell
- Institutional Food Manufacturers, Lowell
- Insurance Brokers, Lowell
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- Insurance Carriers, Lowell
- Insurance Compensation, Lowell
- Insurance Farm, Lowell
- Insurance General Liability, Lowell
- Insurance Motorcycles, Lowell
- Insurance Recreational, Lowell
- Insurance Renters, Lowell
- Insurance Services, Lowell
- Insurance Trucking, Lowell
- Interior Designers, Lowell
- Interior Designers & Decorators, Lowell
- Investment Services & Advisors, Lowell
- Iron, Steel & Metal Fabricators, Lowell - Fabrication Companies
- Irrigation Ditch Contractors, Lowell
- Italian Restaurants, Lowell
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