- Ice Cream & Frozen Yogurt, Douglasville
- Individual & Family Information & Referral Services, Douglasville
- Individual & Family Services, Douglasville
- Industrial & Commercial Cleaning Services & Companies, Douglasville
- Industrial & Commercial Real Estate, Douglasville
- Industrial & Heavy Equipment Repair & Service, Douglasville
- Industrial & Heavy Vehicle Dealers, Douglasville
- Industrial & Personal Service Paper, Boxes & Cardboard, Douglasville
- Industrial Contractors, Douglasville
- Industrial Equipment & Machinery, Douglasville
- Industrial Goods & Products - Hard Goods - Large, Douglasville
- Industrial Goods & Products - Hard Goods - Small, Douglasville
- Industrial Goods & Products - Soft - Large & Small, Douglasville
- Industrial Machinery Manufacturers, Douglasville
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Douglasville
- Industrial Pump Repair & Service, Douglasville - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pumps, etc
- Industrial Supply, Parts & Equipment - Miscellaneous, Douglasville
- Industrial Trucks, Douglasville
- Industry, Douglasville
- Information Technology Services, Douglasville - IT Service
- Insulation Contractors, Douglasville - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Accident, Douglasville
- Insurance Adjusters, Douglasville
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- Insurance Brokers, Douglasville
- Insurance Carriers, Douglasville
- Insurance Claim Processing Services, Douglasville
- Insurance Farm, Douglasville
- Insurance General Liability, Douglasville
- Insurance Motorcycles, Douglasville
- Insurance Renters, Douglasville
- Insurance Services, Douglasville
- Intercom Systems & Services, Douglasville
- Interior Designers, Douglasville
- Interior Designers & Decorators, Douglasville
- Internal Medicine Doctors, Douglasville - Internists Physicians & Surgeons
- International Trade Consultants, Douglasville - Foreign Trade
- Internet Providers, Douglasville
- Internet Services, Douglasville
- Investment Management Services, Douglasville
- Investment Services & Advisors, Douglasville
- Irish Restaurants, Douglasville
- Iron, Steel & Metal Fabricators, Douglasville - Fabrication Companies
- Irrigation Systems & Equipment, Douglasville
- Islamic Church, Douglasville
- Italian Restaurants, Douglasville
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