- Ice Cream & Frozen Yogurt, Houlton
- Industrial & Commercial Cleaning Services & Companies, Houlton
- Industrial & Commercial Real Estate, Houlton
- Industrial Contractors, Houlton
- Industrial Goods & Products - Hard Goods - Large, Houlton
- Industrial Goods & Products - Hard Goods - Small, Houlton
- Industrial Goods & Products - Soft - Large & Small, Houlton
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Houlton
- Industrial Supply, Parts & Equipment - Miscellaneous, Houlton
- Industry, Houlton
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- Information Bureaus & Services, Houlton
- Insurance Brokers, Houlton
- Insurance Carriers, Houlton
- Insurance Claim Processing Services, Houlton
- Insurance Consulting & Information Services, Houlton
- Insurance Farm, Houlton
- Insurance Services, Houlton
- Internet Providers, Houlton
- Internet Services, Houlton
- Invitations & Announcements, Houlton - Baby Announcements, Wedding Invitations, Etc
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