- Ice Cream & Frozen Yogurt, Gloucester
- Ice Wholesale, Gloucester - Dry Ice
- Independent Church, Gloucester
- Individual & Family Information & Referral Services, Gloucester
- Individual & Family Services, Gloucester
- Industrial & Commercial Cleaning Services & Companies, Gloucester
- Industrial & Commercial Real Estate, Gloucester
- Industrial & Personal Service Paper, Boxes & Cardboard, Gloucester
- Industrial Contractors, Gloucester
- Industrial Equipment & Machinery, Gloucester
- Industrial Filters, Gloucester
- Industrial Goods & Products - Hard Goods - Large, Gloucester
- Industrial Goods & Products - Hard Goods - Small, Gloucester
- Industrial Goods & Products - Soft - Large & Small, Gloucester
- Industrial Lifts, Gloucester
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Gloucester
- Industry, Gloucester
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- Information Retrieval Services, Gloucester
- Inks - Manufacturing, Gloucester
- Inspection & Testing Services, Gloucester
- Insulation Contractors, Gloucester - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Advisors, Gloucester
- Insurance Brokers, Gloucester
- Insurance Carriers, Gloucester
- Insurance Consulting & Information Services, Gloucester
- Insurance Services, Gloucester
- Interior Designers, Gloucester
- Interior Designers & Decorators, Gloucester
- Internet Marketing & Advertising Services, Gloucester
- Internet Services, Gloucester
- Investment Services & Advisors, Gloucester
- Invitations & Announcements, Gloucester - Baby Announcements, Wedding Invitations, Etc
- Iron, Steel & Metal Fabricators, Gloucester - Fabrication Companies
- Italian Restaurants, Gloucester
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