- Ice Cream & Frozen Yogurt, Northbrook
- Ice Sports Clubs & Instruction, Northbrook
- Immigration And Naturalization Attorneys & Lawyers, Northbrook
- Immigration Attorneys & Lawyers, Northbrook - Naturalization
- Immigration Lawyers & Attorneys, Northbrook - Naturalization
- Importers, Northbrook
- In Home Services, Northbrook
- Individual & Family Information & Referral Services, Northbrook
- Industrial & Commercial Cleaning Services & Companies, Northbrook
- Industrial & Commercial Real Estate, Northbrook
- Industrial & Commercial Real Estate Companies, Northbrook
- Industrial & Heavy Equipment Repair & Service, Northbrook
- Industrial & Personal Service Paper, Boxes & Cardboard, Northbrook
- Industrial Contractors, Northbrook
- Industrial Developers, Northbrook
- Industrial Equipment & Machinery, Northbrook
- Industrial Equipment & Machinery - Other, Northbrook
- Industrial Equipment & Systems, Northbrook
- Industrial Goods & Products - Hard Goods - Large, Northbrook
- Industrial Goods & Products - Hard Goods - Small, Northbrook
- Industrial Goods & Products - Soft - Large & Small, Northbrook
- Industrial Heaters & Boilers, Northbrook
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Northbrook
- Industrial Pump Repair & Service, Northbrook - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pumps, etc
- Industrial Supply, Parts & Equipment - Miscellaneous, Northbrook
- Industry, Northbrook
- Information Bureaus & Services, Northbrook
- Information Technology Services, Northbrook - IT Service
- Insecticides, Termite & Pest Control, Northbrook - Pesticides
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- Inspection & Testing Services, Northbrook
- Insulation Contractors, Northbrook - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Brokers, Northbrook
- Insurance Carriers, Northbrook
- Insurance Claim Processing Services, Northbrook
- Insurance Consulting & Information Services, Northbrook
- Insurance Farm, Northbrook
- Insurance General Liability, Northbrook
- Insurance Motorcycles, Northbrook
- Insurance Renters, Northbrook
- Insurance Services, Northbrook
- Insurance Underwriters, Northbrook
- Interactive & Multimedia Software, Northbrook
- Interior Designers, Northbrook
- Interior Designers & Decorators, Northbrook
- Internal Medicine Doctors, Northbrook - Internists Physicians & Surgeons
- International Trade Consultants, Northbrook - Foreign Trade
- Internet Entertainment, Northbrook - Internet Services
- Internet Services, Northbrook
- Internet Services Software & Design, Northbrook
- Internet Websites, Northbrook - Web Hosting, etc
- Investment Bankers, Northbrook
- Investment Management Services, Northbrook
- Investment Services & Advisors, Northbrook
- Investments & Mutual Funds, Northbrook
- Invitations & Announcements, Northbrook - Baby Announcements, Wedding Invitations, Etc
- Iron, Steel & Metal Fabricators, Northbrook - Fabrication Companies
- Islamic Church, Northbrook
- Italian Restaurants, Northbrook
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