- Ice Wholesale, Petersburg - Dry Ice
- Importers, Petersburg
- Individual & Family Information & Referral Services, Petersburg
- Industrial & Commercial Cleaning Services & Companies, Petersburg
- Industrial & Commercial Real Estate, Petersburg
- Industrial & Farm Equipment, Petersburg
- Industrial Contractors, Petersburg
- Industrial Equipment & Machinery, Petersburg
- Industrial Goods & Products - Hard Goods - Large, Petersburg
- Industrial Goods & Products - Hard Goods - Small, Petersburg
- Industrial Goods & Products - Soft - Large & Small, Petersburg
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Petersburg
- Industrial Pumps, Petersburg - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industry, Petersburg
- Information Bureaus & Services, Petersburg
- Instruments & Control Equipment, Petersburg
- Insurance Accident, Petersburg
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- Insurance Brokers, Petersburg
- Insurance Carriers, Petersburg
- Insurance Claim Processing Services, Petersburg
- Insurance Farm, Petersburg
- Insurance General Liability, Petersburg
- Insurance Motorcycles, Petersburg
- Insurance Renters, Petersburg
- Insurance Services, Petersburg
- Internal Medicine Doctors, Petersburg - Internists Physicians & Surgeons
- International Restaurants, Petersburg
- International Trade Consultants, Petersburg - Foreign Trade
- Internet Marketing & Advertising Services, Petersburg
- Internet Providers, Petersburg
- Internet Services, Petersburg
- Investment Management Services, Petersburg
- Investment Services & Advisors, Petersburg
- Italian Restaurants, Petersburg
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