- Mail Delivery Service, Coupeville
- Major Appliances, Coupeville - Household & Kitchen
- Manufacturing, Coupeville
- Marine Products And Services, Coupeville
- Marine Services, Coupeville
- Market Research & Analysis , Coupeville - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Coupeville
- Masonry Contractors, Coupeville - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Coupeville
- Massage Therapists & Professional, Coupeville
- Massage Therapy, Coupeville
- Medical Supplies & Equipment, Coupeville
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- Membership Sports & Recreation Clubs, Coupeville
- Mental Health Specialists, Coupeville - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Coupeville
- Midwives, Coupeville
- Miscellaneous Government, Coupeville
- Miscellaneous Industry, Coupeville
- Miscellaneous Personal Services, Coupeville
- Miscellaneous Professional, Coupeville
- Mobile Home Parks & Communities , Coupeville
- Mortgages & Loans, Coupeville
- Motor Vehicle, Coupeville
- Museums, Coupeville
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