- Accounting, Auditing & Bookkeeping Services, Houlton
- Additional Educational Opportunities, Houlton
- Adult & Geriatric Social Services, Houlton
- Adult Abuse Hotline, Houlton
- Agents Brokers & Planning Services, Houlton
- Agricultural & Crop Shipping, Houlton
- Agricultural Crops, Houlton
- Agricultural Insurance, Houlton
- Agriculture, Houlton
- Aircraft Maintenance & Service, Houlton
- Aircraft Repair & Maintenance, Houlton
- Airport, Houlton
- American Legions, Houlton
- American Restaurants, Houlton
- Animal Hospitals, Houlton - Veterinary Clinic & Hospital
- Animal Shelters & Protection Agencies, Houlton
- Apartment Building Operators, Houlton
- Apartments & Buildings, Houlton
- Appliance Rental & Leasing, Houlton
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- Armed Forces Recruiting, Houlton
- Art Galleries & Dealers, Houlton
- Arts & Culture, Houlton
- Asian Restaurants, Houlton
- Attorneys & Lawyers, Houlton
- Attorneys & Lawyers, Houlton
- ATV & RV Dealers, Houlton - All-Terrain & Recreational Vehicles
- Auto Body Repair & Paint Shop, Houlton - Auto Body Shop
- Auto Driving Schools, Houlton
- Auto Electrical Repair & Service, Houlton
- Auto Insurance, Houlton
- Auto Parts Stores - Used & Rebuilt, Houlton - Truck, Car Parts, etc
- Auto Parts, Accessories, Equipment & Supplies, Houlton
- Auto Repair Shops & Maintenance Service, Houlton - Auto Mechanic & Car Repair Shops
- Auto Services, Houlton
- Auto Transmission, Houlton - Manual & Automatic Transmissions
- Auto Transport Companies, Houlton - Truck & Car Transport, Auto Transporters & Drive Away Services
- Auto, Car & Truck Accessories, Houlton
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