- Banks, Ontonagon
- Baptist Churches, Ontonagon
- Barbers, Ontonagon
- Bars, Ontonagon
- Beauty Salons, Ontonagon
- Beer Taverns, Ontonagon
- Boiler & Furnace Contractors, Ontonagon - Installation, Cleaning & Repair Services
- Boiler Repair & Cleaning, Ontonagon
- Book Publishers, Ontonagon - Book Printing & Publishing
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- Builders & Contractors, Ontonagon
- Builders & Contractors - More, Ontonagon
- Building Materials, Ontonagon - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Ontonagon
- Business & Professional Associations, Ontonagon
- Business Legal Services, Ontonagon
- Business Management Consultants, Ontonagon
- Business Services, Ontonagon
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