- Accounting, Auditing & Bookkeeping Services, Houghton
- Acupressure & Acupuncture Specialists, Houghton
- Additional Educational Opportunities, Houghton
- Adult & Geriatric Social Services, Houghton
- Adventist Churches, Houghton
- Advertising, PR & Marketing Services, Houghton
- Agricultural Insurance, Houghton
- Agriculture, Houghton
- Air Duct Cleaning, Houghton - Heating & Air Conditioning Systems
- Alarms, Signaling & Security Equipment & Systems, Houghton
- Alcohol & Drug Prevention Education, Houghton
- Alternative Medicine, Houghton
- American Restaurants, Houghton
- Amusement Parks, Houghton
- Animal Feeds, Houghton
- Animal Hospitals, Houghton - Veterinary Clinic & Hospital
- Animal Protection Organizations, Houghton
- Apartments & Buildings, Houghton
- Apostolic Church, Houghton
- Appliance Rental & Leasing, Houghton
- Appraisers, Houghton
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- Architects, Houghton - Residential, Interior, Commercial, Office & Landscape Architecture Services
- Art Galleries & Dealers, Houghton
- Arts & Crafts Supplies & Stores, Houghton
- Arts & Culture, Houghton
- Asian Restaurants, Houghton
- Assisted Living Facilities, Houghton
- Atm Machines, Houghton
- Attorneys & Lawyers, Houghton
- Attorneys & Lawyers, Houghton
- ATV & RV Dealers, Houghton - All-Terrain & Recreational Vehicles
- Auto Body Repair & Paint Shop, Houghton - Auto Body Shop
- Auto Crushing Service, Houghton - Auto Salvage & Wrecking
- Auto Glass & Windshield Repair & Replacement, Houghton - Window Tinting, etc
- Auto Insurance, Houghton
- Auto Parts, Accessories, Equipment & Supplies, Houghton
- Auto Repair Shops & Maintenance Service, Houghton - Auto Mechanic & Car Repair Shops
- Auto Rustproof & Undercoat Services, Houghton
- Auto Services, Houghton
- Auto Transmission, Houghton - Manual & Automatic Transmissions
- Auto, Car & Truck Accessories, Houghton
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