- Machine Shop & Tool Repair Service, Sturgeon Bay
- Machinery, Supplies & Equipment - Business Production Related, Sturgeon Bay
- Machinery, Supplies & Equipment - Business Supplies Related, Sturgeon Bay
- Machinery, Supplies & Equipment - Construction & Contractor Related, Sturgeon Bay
- Magazine & Newspaper Stands, Sturgeon Bay - Dealers & Distributors
- Mailbox Rental Services, Sturgeon Bay
- Maintenance, Cleaning & Sanitation, Sturgeon Bay
- Major Appliances, Sturgeon Bay - Household & Kitchen
- Malls & Shopping Centers, Sturgeon Bay
- Management Consultants & Services, Sturgeon Bay
- Mandarin Restaurants, Sturgeon Bay
- Manicurists & Pedicurists, Sturgeon Bay
- Manufacturers Agents & Representatives, Sturgeon Bay
- Manufacturers Representative, Sturgeon Bay - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Sturgeon Bay
- Manufacturing Products, Sturgeon Bay
- Marinas & Marina Services, Sturgeon Bay
- Marine Contractors & Designers, Sturgeon Bay
- Marine Electronic Equipment, Sturgeon Bay
- Marine Products And Services, Sturgeon Bay
- Marine Repair & Service Stations, Sturgeon Bay
- Marine Supplies & Equipment, Sturgeon Bay - Boat Supplies
- Marine Supplies & Equipment Repair, Sturgeon Bay - Boat Supplies & Equipment
- Marine Surveyors & Adjustors, Sturgeon Bay
- Marriage & Family Counselors, Sturgeon Bay
- Masonry Contractors, Sturgeon Bay - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Sturgeon Bay
- Massage Therapists & Professional, Sturgeon Bay
- Massage Therapy, Sturgeon Bay
- Mattress & Bedspring Manufacturers, Sturgeon Bay
- Mechanical Contractors, Sturgeon Bay - Install, Service & Repair
- Medical Billing Services, Sturgeon Bay
- Medical Groups & Clinics, Sturgeon Bay - Medical & Health Centers
- Medical Supplies & Equipment, Sturgeon Bay
- Membership Sports & Recreation Clubs, Sturgeon Bay
- Mental Health Clinics, Sturgeon Bay - Treatment Centers
- Mental Health Specialists, Sturgeon Bay - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Plating & Polishing, Sturgeon Bay
- Metal Products, Sturgeon Bay
- Metal Repair Service & Blacksmith, Sturgeon Bay - Iron Works
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- Metal Stampings Manufacturers, Sturgeon Bay
- Methodist Church, Sturgeon Bay
- Mexican Restaurants, Sturgeon Bay
- Mildew Removal & Control, Sturgeon Bay - Mold Removal
- Mini & Self Storage, Sturgeon Bay
- Mirrors, Sturgeon Bay - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Sturgeon Bay
- Miscellaneous Household Item Repair, Sturgeon Bay
- Miscellaneous Agriculture, Sturgeon Bay
- Miscellaneous Government, Sturgeon Bay
- Miscellaneous Industry, Sturgeon Bay
- Miscellaneous Manufacturing, Sturgeon Bay
- Miscellaneous Metal Work Manufacturers, Sturgeon Bay
- Miscellaneous Personal Services, Sturgeon Bay
- Miscellaneous Photographers, Sturgeon Bay
- Miscellaneous Professional, Sturgeon Bay
- Monuments, Tombstones, Markers & Memorials, Sturgeon Bay
- Moravian Churches, Sturgeon Bay
- Mortgage Bankers & Correspondents, Sturgeon Bay
- Mortgage Contracts & Services, Sturgeon Bay
- Motion Picture & Television Production Services, Sturgeon Bay
- Motion Picture Dists & Producers, Sturgeon Bay
- Motion Picture Pre & Post Production Services, Sturgeon Bay
- Motor Vehicle, Sturgeon Bay
- Motor Vehicle Rental & Leasing, Sturgeon Bay
- Motorcycle & Motor Scooters Dealers, Repair & Service, Sturgeon Bay
- Motorcycle Parts, Accessories & Dealers, Sturgeon Bay
- Motorcycle Repair & Service, Sturgeon Bay
- Movie Theaters, Sturgeon Bay
- Moving Companies, Sturgeon Bay
- Moving Supplies & Equipment Rental, Sturgeon Bay
- Moving Truck Rental , Sturgeon Bay
- Mulch, Peat & Moss Products, Sturgeon Bay
- Museums, Sturgeon Bay
- Music, Sturgeon Bay
- Music Lessons, Sturgeon Bay
- Music Lessons - Instrumental, Sturgeon Bay
- Musical Instrument Rental, Sturgeon Bay - Band & Orchestra Instruments
- Musical Instruments Repair, Sales & Service, Sturgeon Bay
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