- Ice Cream & Frozen Yogurt, Placerville
- Independent Care Services, Placerville
- Independent Church, Placerville
- Indian Goods & Products Stores, Placerville
- Indoor Advertising, Placerville
- Industrial & Commercial Cleaning Services & Companies, Placerville
- Industrial & Commercial Real Estate, Placerville
- Industrial & Heavy Equipment Repair & Service, Placerville
- Industrial & Heavy Vehicle Dealers, Placerville
- Industrial Contractors, Placerville
- Industrial Engineers & Designers, Placerville - Architectural Designers
- Industrial Equipment & Machinery, Placerville
- Industrial Goods & Products - Hard Goods - Large, Placerville
- Industrial Goods & Products - Hard Goods - Small, Placerville
- Industrial Goods & Products - Soft - Large & Small, Placerville
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Placerville
- Industrial Pumps, Placerville - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industrial Supply, Parts & Equipment - Miscellaneous, Placerville
- Industrial Trucks, Placerville
- Industry, Placerville
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- Insecticides, Termite & Pest Control, Placerville - Pesticides
- Inspection & Testing Services, Placerville
- Inspection Equipment, Placerville
- Insulation Materials, Placerville - Foam, Cellulose, Fiberglass, Mineral Wool, Rockwool, etc
- Insurance Brokers, Placerville
- Insurance Carriers, Placerville
- Insurance Farm, Placerville
- Insurance Marine, Placerville
- Insurance Services, Placerville
- Interior Designers, Placerville
- Interior Designers & Decorators, Placerville
- Internal Medicine Doctors, Placerville - Internists Physicians & Surgeons
- Internet Providers, Placerville
- Internet Services, Placerville
- Investment Management Services, Placerville
- Investment Services & Advisors, Placerville
- Iron, Steel & Metal Fabricators, Placerville - Fabrication Companies
- Irrigation Systems & Equipment, Placerville
- Italian Restaurants, Placerville
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