- Packaging & Shipping Materials - Wholesale & Manufacturers , Houlton
- Paint & Painting Supplies, Houlton
- Paint Stores, Houlton
- Painting & Wallpaper Installation Contractors, Houlton - Install - Hang Wallpaper & Wallcoverings
- Paper & Cardboard Manufacturers, Houlton
- Paper Finishers Manufacturers, Houlton
- Paper Mill Machinery Manufacturers, Houlton
- Paper Mill Supplies Manufacturers, Houlton
- Passenger Ground Transportation, Houlton
- Passenger Vehicle Dealers, Houlton
- Pavement & Parking Lot Construction, Maintenance & Marking, Houlton
- Paving Contractors - Driveway, Road, Walkway, Houlton - Installation, Repair & Seal - Asphalt & Concrete Pavers
- Pentecostal Churches, Houlton
- Personal Care, Houlton
- Personal Credit Institutions & Services, Houlton
- Personal Injury Attorneys & Lawyers, Houlton
- Personal Injury Attorneys & Lawyers, Houlton
- Personal Injury Lawyers & Attorneys, Houlton
- Personal Legal Services, Houlton
- Personal Services, Houlton
- Personnel Consultants & Services, Houlton
- Pet Care Services, Houlton
- Pet Grooming & Boarding Services, Houlton
- Pet Shops & Supplies, Houlton
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- Pets Stores & Pet Supplies , Houlton
- Pharmacy & Drug Stores, Houlton - Drugstore - Chemists
- Physical Therapists, Houlton - Physical Therapy
- Physicians & Surgeon Services, Houlton
- Pizza Restaurant 1 Of 2, Houlton
- Plumbers & Plumbing Contractors, Houlton - Installation, Repair & Replace Services
- Plumbing Equipment & Portable Toilet Rental & Leasing, Houlton
- Potato Production, Houlton
- Prefabricated Structures & Materials, Houlton
- Prefabricated Wood Buildings Manufacturers, Houlton
- Preschools, Houlton
- Printers Programs, Houlton
- Printers Services, Houlton
- Printing Services & Publishing Services, Houlton
- Prisons City & County, Houlton
- Private Schools Secondary Schools, Houlton
- Product Rental & Leasing, Houlton
- Product Repair Services, Houlton
- Professional, Houlton
- Propane & Natural Gas, Houlton
- Public Accountants, Houlton
- Publishing & Printing Manufacturers, Houlton
- Pulpwood & Saw Timber, Houlton
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