- Accounting, Auditing & Bookkeeping Services, Haddam
- Adult & Geriatric Social Services, Haddam
- Advertising, PR & Marketing Services, Haddam
- Agriculture, Haddam
- Alzheimers Care Centers, Haddam
- Amusement Parks, Haddam
- Animal Hospitals, Haddam - Veterinary Clinic & Hospital
- Antique Stores, Haddam - Antique Mall, Dealers & Shops
- Apartment Building Operators, Haddam
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