- Ice Cream & Frozen Yogurt, Guthrie
- Individual & Family Services, Guthrie
- Industrial & Commercial Cleaning Services & Companies, Guthrie
- Industrial & Commercial Real Estate, Guthrie
- Industrial & Heavy Equipment Repair & Service, Guthrie
- Industrial & Heavy Vehicle Dealers, Guthrie
- Industrial Contractors, Guthrie
- Industrial Equipment & Machinery, Guthrie
- Industrial Goods & Products - Hard Goods - Large, Guthrie
- Industrial Goods & Products - Hard Goods - Small, Guthrie
- Industrial Goods & Products - Soft - Large & Small, Guthrie
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Guthrie
- Industrial Pump Repair & Service, Guthrie - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pumps, etc
- Industrial Tanks, Guthrie
- Industry, Guthrie
- Information Bureaus & Services, Guthrie
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- Insulation Contractors, Guthrie - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Brokers, Guthrie
- Insurance Carriers, Guthrie
- Insurance Carriers By Specialty, Guthrie
- Insurance Farm, Guthrie
- Insurance General Liability, Guthrie
- Insurance Medicare, Guthrie
- Insurance Motorcycles, Guthrie
- Insurance Renters, Guthrie
- Insurance Services, Guthrie
- Interior Designers, Guthrie
- Interior Designers & Decorators, Guthrie
- Internal Medicine Doctors, Guthrie - Internists Physicians & Surgeons
- Investment Management Services, Guthrie
- Investment Services & Advisors, Guthrie
- Italian Restaurants, Guthrie
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