- Ice Cream & Frozen Yogurt, Frederick
- Ice Wholesale, Frederick - Dry Ice
- Image Consultants Personal, Frederick
- Immigration And Naturalization Attorneys & Lawyers, Frederick
- Immigration Attorneys & Lawyers, Frederick - Naturalization
- Immigration Lawyers & Attorneys, Frederick - Naturalization
- Import Nonclassifiable Services, Frederick
- Import Services, Frederick
- Imported Auto Parts, Frederick
- Importers, Frederick
- In Home Services, Frederick
- In-Home Direct Sales, Frederick
- Independent Church, Frederick
- Individual & Family Information & Referral Services, Frederick
- Industrial & Commercial Cleaning Services & Companies, Frederick
- Industrial & Commercial Real Estate, Frederick
- Industrial & Commercial Real Estate Companies, Frederick
- Industrial & Heavy Equipment Repair & Service, Frederick
- Industrial & Personal Service Paper, Boxes & Cardboard, Frederick
- Industrial Contractors, Frederick
- Industrial Engines, Frederick
- Industrial Equipment & Machinery, Frederick
- Industrial Goods & Products - Hard Goods - Large, Frederick
- Industrial Goods & Products - Hard Goods - Small, Frederick
- Industrial Goods & Products - Soft - Large & Small, Frederick
- Industrial Heaters & Boilers, Frederick
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Frederick
- Industrial Maintenance & Cleaning Contractors, Frederick
- Industrial Pump Repair & Service, Frederick - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pumps, etc
- Industrial Pumps, Frederick - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industrial Supply, Parts & Equipment - Miscellaneous, Frederick
- Industrial Trucks, Frederick
- Industrial Waste Disposal, Frederick
- Industrial Waste Recycling, Frederick
- Industry, Frederick
- Infectious Disease Specialists, Frederick - Doctors, Physicians & Surgeons
- Information Bureaus & Services, Frederick
- Information Processing & Retrieval Systems, Frederick
- Information Technology Services, Frederick - IT Service
- Inspection & Testing Services, Frederick
- Insulation Contractors, Frederick - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
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- Insurance Aircraft & Aviation, Frederick
- Insurance Appraisal, Frederick
- Insurance Brokers, Frederick
- Insurance Carriers, Frederick
- Insurance Carriers By Specialty, Frederick
- Insurance Compensation, Frederick
- Insurance Consulting & Information Services, Frederick
- Insurance Contractors, Frederick
- Insurance Farm, Frederick
- Insurance General Liability, Frederick
- Insurance Inspection Services, Frederick
- Insurance Motorcycles, Frederick
- Insurance Real Property, Frederick
- Insurance Renters, Frederick
- Insurance Services, Frederick
- Insurance Supplemental, Frederick
- Insurance Travel, Frederick
- Interior Designers, Frederick
- Interior Designers & Decorators, Frederick
- Internal Medicine Doctors, Frederick - Internists Physicians & Surgeons
- Internet - Broadband, Frederick
- Internet Development, Frederick
- Internet Entertainment, Frederick - Internet Services
- Internet Home Page Development & Consulting, Frederick
- Internet Marketing & Advertising Services, Frederick
- Internet Products - Hardware & Software Providers, Frederick
- Internet Providers, Frederick
- Internet Services, Frederick
- Internet Websites, Frederick - Web Hosting, etc
- Investment Bankers, Frederick
- Investment Management Services, Frederick
- Investment Services & Advisors, Frederick
- Investments & Mutual Funds, Frederick
- Invitations & Announcements, Frederick - Baby Announcements, Wedding Invitations, Etc
- Irish Restaurants, Frederick
- Iron Work Contractors, Frederick
- Iron, Steel & Metal Fabricators, Frederick - Fabrication Companies
- Irrigation Systems & Equipment, Frederick
- Islamic Church, Frederick
- Italian Foods, Frederick
- Italian Restaurants, Frederick
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