- Ice Cream & Frozen Yogurt, Lewiston
- Ice Skating Rinks, Lewiston
- Ice Sports Clubs & Instruction, Lewiston
- Imported Auto Parts, Lewiston
- In Home Services, Lewiston
- Indian Restaurants, Lewiston
- Individual & Family Information & Referral Services, Lewiston
- Individual & Family Services, Lewiston
- Industrial & Commercial Cleaning Services & Companies, Lewiston
- Industrial & Commercial Real Estate, Lewiston
- Industrial & Heavy Vehicle Dealers, Lewiston
- Industrial & Personal Service Paper, Boxes & Cardboard, Lewiston
- Industrial Contractors, Lewiston
- Industrial Equipment & Machinery, Lewiston
- Industrial Equipment & Machinery - Other, Lewiston
- Industrial Goods & Products - Hard Goods - Large, Lewiston
- Industrial Goods & Products - Hard Goods - Small, Lewiston
- Industrial Goods & Products - Soft - Large & Small, Lewiston
- Industrial Heaters & Boilers, Lewiston
- Industrial Lifts, Lewiston
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Lewiston
- Industry, Lewiston
- Information Bureaus & Services, Lewiston
- Information Retrieval Services, Lewiston
- Information Technology Services, Lewiston - IT Service
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- Inspection & Testing Services, Lewiston
- Insulation & Energy Conservation Materials, Lewiston
- Insulation Contractors, Lewiston - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Attorneys & Lawyers, Lewiston
- Insurance Attorneys & Lawyers, Lewiston
- Insurance Carriers, Lewiston
- Insurance Claim Processing Services, Lewiston
- Insurance Consulting & Information Services, Lewiston
- Insurance Farm, Lewiston
- Insurance General Liability, Lewiston
- Insurance Lawyers & Attorneys, Lewiston
- Insurance Motorcycles, Lewiston
- Insurance Renters, Lewiston
- Insurance Services, Lewiston
- Interior Designers, Lewiston
- Interior Designers & Decorators, Lewiston
- Internal Medicine Doctors, Lewiston - Internists Physicians & Surgeons
- Internet Development, Lewiston
- Internet Home Page Development & Consulting, Lewiston
- Internet Services, Lewiston
- Investment Bankers, Lewiston
- Investment Services & Advisors, Lewiston
- Iron, Steel & Metal Fabricators, Lewiston - Fabrication Companies
- Islamic Church, Lewiston
- Italian Restaurants, Lewiston
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