- Dams, Waterways, & Docks Contractors, Portsmouth
- Dance Companies, Portsmouth
- Day Spas, Portsmouth
- Decorating & Designing Services, Portsmouth
- Dental Bonding & Cosmetic Dentistry, Portsmouth - Cosmetic Dentist & Tooth Bonding
- Dental Hygienists, Portsmouth
- Dental Information & Referral Service, Portsmouth - Educational, Referral & Support Service Centers
- Dentists, Portsmouth
- Diesel Engine, Portsmouth
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- Diesel Engine Repair & Service, Portsmouth
- Diner Restaurants, Portsmouth
- Dispensing Machines, Portsmouth
- Doctorate Degree, Portsmouth
- Doctors, Physicians & Surgeons, Portsmouth
- Donuts, Portsmouth
- Drainage Contractors, Portsmouth - Install & Repair Drainage Systems
- Drinking Establishments, Portsmouth
- Dry Cleaning & Laundry, Portsmouth - Dry Cleaners
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