- Hair Care Professionals, Plainville
- Hallmark Gift Shop, Plainville
- Halls, Auditoriums & Ballrooms Rental, Plainville
- Hamburger Restaurants, Plainville
- Hardware Stores, Plainville
- Health & Fitness Program Consultants & Trainers, Plainville
- Health & Medical, Plainville
- Health And Medical Centers, Plainville
- Health Clubs & Gymnasiums, Plainville
- Healthcare Providers, Practitioners & Professionals, Plainville
- Heating & Air-Conditioning Contractors, Plainville - HVAC Contractors - Installation, Repair, Replace Service, etc
- Heating & Plumbing Supplies Stores, Plainville
- Heating Contractors, Plainville - Heating Systems - Installation & Repair
- Hobby & Model Shops & Supplies, Plainville
- Home Additions & Remodeling Contractors, Plainville - Refinishing & Restoration
- Home Decor Stores, Plainville - Home Decorations, Supplies & Accessories
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- Home Electronics, Plainville
- Home Furnishings, Plainville - Home Decor Stores, Items & Accessories
- Home Theaters, Plainville
- Homeowners Insurance, Plainville
- Horse Stables, Plainville
- Horseback Riding Lessons & Instruction, Plainville - Horse Riding School
- Hospital, Dental & Medical Equipment & Supplies, Plainville
- Hospitals, Plainville
- Hot Dog Restaurants, Plainville
- Hotel Motel & Resort Reservations, Plainville
- Hotels & Motels, Plainville
- House & Apartment Cleaning, Plainville
- Household & Commercial Appliances Stores, Plainville
- Household Goods & Furniture Storage , Plainville
- Housing Authority, Plainville
- Hydraulic Equipment & Supplies, Plainville
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