- Ice Cream & Frozen Yogurt, Somerville
- Image Consultants Personal, Somerville
- Importers, Somerville
- Indian Restaurants, Somerville
- Individual & Family Information & Referral Services, Somerville
- Individual & Family Services, Somerville
- Industrial & Commercial Cleaning Services & Companies, Somerville
- Industrial & Commercial Real Estate, Somerville
- Industrial & Heavy Vehicle Dealers, Somerville
- Industrial & Personal Service Paper, Boxes & Cardboard, Somerville
- Industrial Contractors, Somerville
- Industrial Engineers & Designers, Somerville - Architectural Designers
- Industrial Equipment & Machinery, Somerville
- Industrial Filters, Somerville
- Industrial Goods & Products - Hard Goods - Large, Somerville
- Industrial Goods & Products - Hard Goods - Small, Somerville
- Industrial Goods & Products - Soft - Large & Small, Somerville
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Somerville
- Industry, Somerville
- Information & Records Management Services, Somerville
- Information Bureaus & Services, Somerville
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- Information Retrieval Services, Somerville
- Instruments & Control Equipment, Somerville
- Insulation & Energy Conservation Materials, Somerville
- Insurance Appraisal, Somerville
- Insurance Carriers, Somerville
- Insurance General Liability, Somerville
- Insurance Inspection Services, Somerville
- Insurance Major Medical, Somerville
- Insurance Motorcycles, Somerville
- Insurance Renters, Somerville
- Insurance Services, Somerville
- Interior Designers, Somerville
- Interior Designers & Decorators, Somerville
- International Restaurants, Somerville
- Internet Providers, Somerville
- Internet Services, Somerville
- Internet Shopping, Somerville
- Investment Services & Advisors, Somerville
- Invitations & Announcements, Somerville - Baby Announcements, Wedding Invitations, Etc
- Iron, Steel & Metal Fabricators, Somerville - Fabrication Companies
- Italian Restaurants, Somerville
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