- Independent Church, Rochester
- Individual & Family Services, Rochester
- Individual Retirement Accounts (I R A), Rochester
- Industrial & Commercial Cleaning Services & Companies, Rochester
- Industrial & Heavy Equipment Repair & Service, Rochester
- Industrial & Heavy Vehicle Dealers, Rochester
- Industrial Contractors, Rochester
- Industrial Developers, Rochester
- Industrial Equipment & Machinery, Rochester
- Industrial Goods & Products - Hard Goods - Large, Rochester
- Industrial Goods & Products - Hard Goods - Small, Rochester
- Industrial Goods & Products - Soft - Large & Small, Rochester
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Rochester
- Industrial Organic Chemicals Manufacturers, Rochester
- Industrial Pump Repair & Service, Rochester - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pumps, etc
- Industrial Pumps, Rochester - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industrial Trucks, Rochester
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- Industry, Rochester
- Information Retrieval Services, Rochester
- Inspection & Testing Services, Rochester
- Insulation Contractors, Rochester - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Carriers, Rochester
- Insurance Consulting & Information Services, Rochester
- Insurance Farm, Rochester
- Insurance Services, Rochester
- Interior Designers & Decorators, Rochester
- Internal Medicine Doctors, Rochester - Internists Physicians & Surgeons
- Internet Providers, Rochester
- Internet Services, Rochester
- Investment Management Services, Rochester
- Investment Services & Advisors, Rochester
- Iron, Steel & Metal Fabricators, Rochester - Fabrication Companies
- Italian Restaurants, Rochester
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