- Ice Cream & Frozen Yogurt, Effingham
- Ice Wholesale, Effingham - Dry Ice
- Individual & Family Information & Referral Services, Effingham
- Industrial & Commercial Cleaning Services & Companies, Effingham
- Industrial & Commercial Real Estate, Effingham
- Industrial & Heavy Equipment Repair & Service, Effingham
- Industrial & Heavy Vehicle Dealers, Effingham
- Industrial & Personal Service Paper, Boxes & Cardboard, Effingham
- Industrial Contractors, Effingham
- Industrial Equipment & Machinery, Effingham
- Industrial Goods & Products - Hard Goods - Large, Effingham
- Industrial Goods & Products - Hard Goods - Small, Effingham
- Industrial Goods & Products - Soft - Large & Small, Effingham
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Effingham
- Industrial Supply, Parts & Equipment - Miscellaneous, Effingham
- Industrial Trucks, Effingham
- Industrial Waterway & Dock Construction, Effingham
- Industry, Effingham
- Information Bureaus & Services, Effingham
- Insecticides, Termite & Pest Control, Effingham - Pesticides
- Inspection & Testing Services, Effingham
- Insulation Contractors, Effingham - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
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- Insurance Adjusters, Effingham
- Insurance Attorneys & Lawyers, Effingham
- Insurance Attorneys & Lawyers, Effingham
- Insurance Brokers, Effingham
- Insurance Carriers, Effingham
- Insurance Claim Processing Services, Effingham
- Insurance Dental, Effingham
- Insurance Farm, Effingham
- Insurance General Liability, Effingham
- Insurance Lawyers & Attorneys, Effingham
- Insurance Motorcycles, Effingham
- Insurance Renters, Effingham
- Insurance Services, Effingham
- Interdenominational Church, Effingham
- Interior Designers, Effingham
- Interior Designers & Decorators, Effingham
- Internal Medicine Doctors, Effingham - Internists Physicians & Surgeons
- Internet Services, Effingham
- Investment Management Services, Effingham
- Investment Services & Advisors, Effingham
- Iron, Steel & Metal Fabricators, Effingham - Fabrication Companies
- Italian Restaurants, Effingham
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