- Bakeries, Rumford
- Balloons, Rumford
- Balloons - Novelty, Toy & Decorative, Rumford
- Banks, Rumford
- Baptist Churches, Rumford
- Bars & Grills, Rumford
- Beauty Salons, Rumford
- Beverage Stores, Rumford
- Bingo Halls, Supplies & Equipment, Rumford
- Bistros, Rumford
- Blood Bank & Center, Rumford
- Book Stores, Rumford
- Bookkeeping Services Licensed, Rumford
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- Bookkeeping Systems & Services, Rumford
- Books, Magazines & Newspapers Stores, Rumford - Bookstores
- Breakfast Restaurants, Rumford
- Builders & Contractors, Rumford
- Builders & Contractors - More, Rumford
- Building Construction Consultants, Rumford - Construction Management & Consulting
- Building Materials & Supplies, Rumford
- Burglar Alarm Systems, Rumford
- Business & Professional Associations, Rumford
- Business Insurance, Rumford
- Business Legal Services, Rumford
- Business Management Consultants, Rumford
- Business Services, Rumford
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