- Ice Cream & Frozen Yogurt, Guilford
- Individual & Family Information & Referral Services, Guilford
- Industrial & Commercial Cleaning Services & Companies, Guilford
- Industrial & Commercial Real Estate, Guilford
- Industrial & Heavy Equipment Repair & Service, Guilford
- Industrial & Personal Service Paper, Boxes & Cardboard, Guilford
- Industrial Contractors, Guilford
- Industrial Engineers & Designers, Guilford - Architectural Designers
- Industrial Equipment & Machinery, Guilford
- Industrial Goods & Products - Hard Goods - Large, Guilford
- Industrial Goods & Products - Hard Goods - Small, Guilford
- Industrial Goods & Products - Soft - Large & Small, Guilford
- Industrial Heaters & Boilers, Guilford
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Guilford
- Industrial Pumps, Guilford - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industry, Guilford
- Information & Records Management Services, Guilford
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- Information Retrieval Services, Guilford
- Information Technology Services, Guilford - IT Service
- Insulation Contractors, Guilford - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Carriers, Guilford
- Insurance General Liability, Guilford
- Insurance Motorcycles, Guilford
- Insurance Renters, Guilford
- Insurance Services, Guilford
- Interior Designers, Guilford
- Interior Designers & Decorators, Guilford
- Internal Medicine Doctors, Guilford - Internists Physicians & Surgeons
- Internet Providers, Guilford
- Internet Services, Guilford
- Investment Management Services, Guilford
- Investment Services & Advisors, Guilford
- Irrigation Systems & Equipment, Guilford
- Italian Restaurants, Guilford
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