- Ice Cream & Frozen Yogurt, Mercer Island
- Industrial & Commercial Cleaning Services & Companies, Mercer Island
- Industrial & Commercial Real Estate, Mercer Island
- Industrial & Personal Service Paper, Boxes & Cardboard, Mercer Island
- Industrial Developers, Mercer Island
- Industrial Equipment & Machinery, Mercer Island
- Industrial Goods & Products - Hard Goods - Large, Mercer Island
- Industrial Goods & Products - Hard Goods - Small, Mercer Island
- Industrial Goods & Products - Soft - Large & Small, Mercer Island
- Industrial Supply, Parts & Equipment - Miscellaneous, Mercer Island
- Industry, Mercer Island
- Insulation Material , Mercer Island - Contractors Supplies & Equipment
- Insurance Brokers, Mercer Island
- Insurance Carriers, Mercer Island
- Insurance Claim Processing Services, Mercer Island
- Insurance Farm, Mercer Island
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- Insurance General Liability, Mercer Island
- Insurance Motorcycles, Mercer Island
- Insurance Renters, Mercer Island
- Insurance Services, Mercer Island
- Interior Designers, Mercer Island
- Interior Designers & Decorators, Mercer Island
- Internal Medicine Doctors, Mercer Island - Internists Physicians & Surgeons
- Internet Development, Mercer Island
- Internet Home Page Development & Consulting, Mercer Island
- Internet Marketing & Advertising Services, Mercer Island
- Internet Services, Mercer Island
- Investment Management Services, Mercer Island
- Investment Services & Advisors, Mercer Island
- Irrigation Systems & Equipment, Mercer Island
- Italian Restaurants, Mercer Island
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