- Machinery, Supplies & Equipment - Business Production Related, Sister Bay
- Magazine & Newspaper Stands, Sister Bay - Dealers & Distributors
- Maintenance, Cleaning & Sanitation, Sister Bay
- Major Appliances, Sister Bay - Household & Kitchen
- Management Consultants & Services, Sister Bay
- Manufacturing, Sister Bay
- Marinas & Marina Services, Sister Bay
- Marine Products And Services, Sister Bay
- Marine Repair & Service Stations, Sister Bay
- Marine Supplies & Equipment, Sister Bay - Boat Supplies
- Marine Supplies & Equipment Repair, Sister Bay - Boat Supplies & Equipment
- Massage Therapists & Professional, Sister Bay
- Massage Therapy, Sister Bay
- Membership Sports & Recreation Clubs, Sister Bay
- Metaphysical Churches, Sister Bay
- Mexican Restaurants, Sister Bay
- Mildew Removal & Control, Sister Bay - Mold Removal
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- Mini Golf Courses, Sister Bay
- Miscellaneous Household Item Repair, Sister Bay
- Miscellaneous Agriculture, Sister Bay
- Miscellaneous Government, Sister Bay
- Miscellaneous Personal Services, Sister Bay
- Miscellaneous Professional, Sister Bay
- Moravian Churches, Sister Bay
- Mortgage Bankers & Correspondents, Sister Bay
- Mortgage Contracts & Services, Sister Bay
- Motor Vehicle, Sister Bay
- Motor Vehicle Rental & Leasing, Sister Bay
- Moving Truck Rental , Sister Bay
- Mulch, Peat & Moss Products, Sister Bay
- Music, Sister Bay
- Musical Instrument Rental, Sister Bay - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Sister Bay
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