- Bakeries, Mercersburg
- Banks, Mercersburg
- Barber Shops, Mercersburg
- Barbers, Mercersburg
- Bars, Mercersburg
- Beauty Salons, Mercersburg
- Bed & Breakfast, Mercersburg
- Beer Taverns, Mercersburg
- Beverage Stores, Mercersburg
- Bible Church, Mercersburg
- Brethren Church, Mercersburg
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- Builders & Contractors, Mercersburg
- Builders & Contractors - More, Mercersburg
- Building Construction Consultants, Mercersburg - Construction Management & Consulting
- Building Hardware & Materials, Mercersburg
- Building Materials & Supplies, Mercersburg
- Business & Professional Associations, Mercersburg
- Business Brokers, Mercersburg
- Business Legal Services, Mercersburg
- Business Services, Mercersburg
- Butcher Shops, Mercersburg
- Butchers & Meat Markets - Manufacturers, Mercersburg
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