- Ice Cream & Frozen Yogurt, Maitland
- Importers, Maitland
- Independent Church, Maitland
- Industrial & Commercial Cleaning Services & Companies, Maitland
- Industrial & Commercial Real Estate, Maitland
- Industrial & Heavy Equipment Repair & Service, Maitland
- Industrial & Heavy Equipment Vehicle Rental & Leasing, Maitland
- Industrial Contractors, Maitland
- Industrial Equipment & Machinery, Maitland
- Industrial Goods & Products - Hard Goods - Large, Maitland
- Industrial Goods & Products - Hard Goods - Small, Maitland
- Industrial Heaters & Boilers, Maitland
- Industrial Supply, Parts & Equipment - Miscellaneous, Maitland
- Industrial Waterway & Dock Construction, Maitland
- Industry, Maitland
- Information Technology Services, Maitland - IT Service
- Infrared Spectroscopy Testing Labs, Maitland
- Insurance Adjusters, Maitland
- Insurance Adjusters Public, Maitland
- Insurance Appraisal, Maitland
- Insurance Brokers, Maitland
- Insurance Carriers, Maitland
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- Insurance Claim Processing Services, Maitland
- Insurance Consulting & Information Services, Maitland
- Insurance Credit, Maitland
- Insurance Dental, Maitland
- Insurance Farm, Maitland
- Insurance General Liability, Maitland
- Insurance Inspection Services, Maitland
- Insurance Major Medical, Maitland
- Insurance Motorcycles, Maitland
- Insurance Renters, Maitland
- Insurance Services, Maitland
- Insurance Underwriters, Maitland
- Interior Designers, Maitland
- Interior Designers & Decorators, Maitland
- Internet Marketing & Advertising Services, Maitland
- Internet Services, Maitland
- Investment Management Services, Maitland
- Investment Services & Advisors, Maitland
- Investments & Mutual Funds, Maitland
- Iron, Steel & Metal Fabricators, Maitland - Fabrication Companies
- Italian Restaurants, Maitland
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