- Machine Shop & Tool Repair Service, Calais
- Machinery, Supplies & Equipment - Construction & Contractor Related, Calais
- Mail Delivery Service, Calais
- Major Appliances, Calais - Household & Kitchen
- Management Consultants & Services, Calais
- Manufacturing, Calais
- Market Research & Analysis , Calais - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Calais
- Masonry Materials & Supplies, Calais
- Medical Groups & Clinics, Calais - Medical & Health Centers
- Medical Supplies & Equipment, Calais
- Mental Health Clinics, Calais - Treatment Centers
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- Mental Health Specialists, Calais - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Calais
- Mexican Restaurants, Calais
- Miscellaneous Household Item Repair, Calais
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Calais
- Miscellaneous Government, Calais
- Miscellaneous Personal Services, Calais
- Mortgage Bankers & Correspondents, Calais
- Motor Vehicle, Calais
- Motor Vehicle Rental & Leasing, Calais
- Movie Theaters, Calais
- Moving Truck Rental , Calais
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