- Machinery, Supplies & Equipment - Business Production Related, Waterville
- Machinery, Supplies & Equipment - Business Supplies Related, Waterville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Waterville
- Mail Delivery Service, Waterville
- Mailbox Rental Services, Waterville
- Mailing, Delivery & Courier Service, Waterville
- Maintenance, Cleaning & Sanitation, Waterville
- Major Appliances, Waterville - Household & Kitchen
- Malpractice Attorneys & Lawyers, Waterville
- Malpractice Attorneys & Lawyers, Waterville
- Malpractice Lawyers & Attorneys, Waterville
- Management Consultants & Services, Waterville
- Manicurists & Pedicurists, Waterville
- Manufacturing, Waterville
- Manufacturing Products, Waterville
- Market Research & Analysis , Waterville - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Waterville
- Masonry Contractors, Waterville - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Waterville
- Massage Therapists & Professional, Waterville
- Massage Therapy, Waterville
- Meat Market, Wholesale & Products, Waterville
- Medical Supplies & Equipment, Waterville
- Membership Sports & Recreation Clubs, Waterville
- Mental Health Clinics, Waterville - Treatment Centers
- Mental Health Specialists, Waterville - Psychologist, Psychiatrist, Psychotherapist, etc
- Metaphysical Churches, Waterville
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- Methodist Church, Waterville
- Mexican Restaurants, Waterville
- Middle Eastern Restaurants, Waterville
- Midwives, Waterville
- Mildew Removal & Control, Waterville - Mold Removal
- Mini & Self Storage, Waterville
- Mini Golf Courses, Waterville
- Miscellaneous Business Services, Waterville
- Miscellaneous Government, Waterville
- Miscellaneous Personal Services, Waterville
- Miscellaneous Professional, Waterville
- Mortgage Bankers & Correspondents, Waterville
- Motion Picture Pre & Post Production Services, Waterville
- Motivational & Self Improvement Schools, Waterville
- Motivational Speakers & Consultants, Waterville - Speakers, Lectures & Seminars
- Motor Vehicle, Waterville
- Motor Vehicle Rental & Leasing, Waterville
- Movie Theaters, Waterville
- Moving & Storage Supplies & Equipment, Waterville
- Moving Companies, Waterville
- Moving Truck Rental , Waterville
- Museums, Waterville
- Music, Waterville
- Musical Instruments & Equipment Stores, Waterville
- Musical Instruments - Violins, Waterville
- Musical Recording Services, Waterville
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