- Ice Cream & Frozen Yogurt, Rochester
- Ice Skating Clubs, Rochester
- Ice Sports Clubs & Instruction, Rochester
- Ice Wholesale, Rochester - Dry Ice
- Image Consultants Personal, Rochester
- Immigration And Naturalization Attorneys & Lawyers, Rochester
- Immigration Attorneys & Lawyers, Rochester - Naturalization
- Immigration Lawyers & Attorneys, Rochester - Naturalization
- Imported Auto Parts, Rochester
- Indian Restaurants, Rochester
- Individual & Family Information & Referral Services, Rochester
- Indoor Advertising, Rochester
- Industrial & Commercial Cleaning Services & Companies, Rochester
- Industrial & Commercial Real Estate, Rochester
- Industrial & Heavy Equipment Repair & Service, Rochester
- Industrial & Personal Service Paper, Boxes & Cardboard, Rochester
- Industrial Contractors, Rochester
- Industrial Equipment & Machinery, Rochester
- Industrial Equipment & Systems, Rochester
- Industrial Generators, 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 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 Supply, Parts & Equipment - Miscellaneous, Rochester
- Industry, Rochester
- Information Bureaus & Services, Rochester
- Information Retrieval Services, Rochester
- Information Technology Services, Rochester - IT Service
- Inspection & Testing Services, Rochester
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- Insulation Contractors, Rochester - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Adjusters, Rochester
- Insurance Brokers, Rochester
- Insurance Carriers, Rochester
- Insurance Carriers By Specialty, Rochester
- Insurance Claim Processing Services, Rochester
- Insurance Consulting & Information Services, Rochester
- Insurance Dental, Rochester
- Insurance Farm, Rochester
- Insurance General Liability, Rochester
- Insurance Medicare, Rochester
- Insurance Motorcycles, Rochester
- Insurance Renters, Rochester
- Insurance Services, Rochester
- Insurance Underwriters, Rochester
- Interior Designers, Rochester
- Interior Designers & Decorators, Rochester
- International Restaurants, Rochester
- Internet - Voice Application, Rochester
- Internet Development, Rochester
- Internet Home Page Development & Consulting, Rochester
- Internet Marketing & Advertising Services, Rochester
- Internet Providers, Rochester
- Internet Services, Rochester
- Investment Bankers, Rochester
- Investment Management Services, Rochester
- Investment Services & Advisors, Rochester
- Iron, Steel & Metal Fabricators, Rochester - Fabrication Companies
- Irrigation Systems & Equipment, Rochester
- Irrigation Systems Repair & Service, Rochester
- Italian Restaurants, Rochester
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