- Ice Cream & Frozen Desserts, Vacaville
- Ice Cream & Frozen Yogurt, Vacaville
- Ice Skating Clubs, Vacaville
- Ice Skating Rinks, Vacaville
- Indian Restaurants, Vacaville
- Industrial & Commercial Cleaning Services & Companies, Vacaville
- Industrial & Commercial Real Estate, Vacaville
- Industrial & Commercial Real Estate Companies, Vacaville
- Industrial & Heavy Equipment Repair & Service, Vacaville
- Industrial & Heavy Equipment Vehicle Rental & Leasing, Vacaville
- Industrial & Heavy Vehicle Dealers, Vacaville
- Industrial & Personal Service Paper, Boxes & Cardboard, Vacaville
- Industrial Contractors, Vacaville
- Industrial Equipment & Machinery, Vacaville
- Industrial Goods & Products - Hard Goods - Large, Vacaville
- Industrial Goods & Products - Hard Goods - Small, Vacaville
- Industrial Goods & Products - Soft - Large & Small, Vacaville
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Vacaville
- Industrial Maintenance & Cleaning Contractors, Vacaville
- Industrial Piping Process, Vacaville
- Industrial Pump Repair & Service, Vacaville - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pumps, etc
- Industrial Pumps, Vacaville - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industrial Supply, Parts & Equipment - Miscellaneous, Vacaville
- Industrial Waste Recycling, Vacaville
- Industry, Vacaville
- Information Bureaus & Services, Vacaville
- Information Retrieval Services, Vacaville
- Information Technology Services, Vacaville - IT Service
- Inks - Manufacturing, Vacaville
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- Insecticides, Termite & Pest Control, Vacaville - Pesticides
- Inspection & Testing Services, Vacaville
- Instrument Manufacturers, Vacaville
- Instruments, Vacaville - Control Equipment
- Insulation Contractors Commercial & Industrial, Vacaville
- Insurance Brokers, Vacaville
- Insurance Carriers, Vacaville
- Insurance Compensation, Vacaville
- Insurance Farm, Vacaville
- Insurance General Liability, Vacaville
- Insurance Motorcycles, Vacaville
- Insurance Renters, Vacaville
- Insurance Services, Vacaville
- Insurance Underwriters, Vacaville
- Interior Designers, Vacaville
- Interior Designers & Decorators, Vacaville
- Internal Medicine Doctors, Vacaville - Internists Physicians & Surgeons
- International Community Of Christ Church, Vacaville
- Internet Providers, Vacaville
- Internet Services, Vacaville
- Investment Bankers, Vacaville
- Investment Management Services, Vacaville
- Investment Services & Advisors, Vacaville
- Iron, Steel & Metal Fabricators, Vacaville - Fabrication Companies
- Irrigation Systems & Equipment, Vacaville
- Italian Food Products, Vacaville
- Italian Foods, Vacaville
- Italian Restaurants, Vacaville
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