- Machine Shop & Tool Repair Service, Cedarburg
- Machinery And Equipment Manufacturers, Cedarburg
- Machinery, Supplies & Equipment - Business Production Related, Cedarburg
- Machinery, Supplies & Equipment - Business Supplies Related, Cedarburg
- Machinery, Supplies & Equipment - Construction & Contractor Related, Cedarburg
- Major Appliances, Cedarburg - Household & Kitchen
- Malls & Shopping Centers, Cedarburg
- Management Consultants & Services, Cedarburg
- Manicurists & Pedicurists, Cedarburg
- Manufacturers Agents & Representatives, Cedarburg
- Manufacturers Representative, Cedarburg - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Cedarburg
- Manufacturing Products, Cedarburg
- Marketing Schools, Cedarburg
- Marriage & Family Counselors, Cedarburg
- Martial Arts & Self Defense Schools, Cedarburg
- Masonry Contractors, Cedarburg - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Cedarburg
- Material Handling & Heavy Machinery & Equipment, Cedarburg
- Material Handling Equipment, Cedarburg - Conveyor Belt, Pallet Jack, Forklift, etc
- Meat Market, Wholesale & Products, Cedarburg
- Medical & Dental Management, Cedarburg
- Medical Billing Services, Cedarburg
- Medical Equipment Manufacturers, Cedarburg
- Medical Groups & Clinics, Cedarburg - Medical & Health Centers
- Medical Supplies & Equipment, Cedarburg
- Membership Sports & Recreation Clubs, Cedarburg
- Mental Health Clinics, Cedarburg - Treatment Centers
- Merchandising & Marketing Consultants, Cedarburg
- Merle Norman Cosmetics, Cedarburg
- Metal Stampings Manufacturers, Cedarburg
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- Methodist Church, Cedarburg
- Mexican Restaurants, Cedarburg
- Mini & Self Storage, Cedarburg
- Miscellaneous Business Product Repair, Cedarburg
- Miscellaneous Household Item Repair, Cedarburg
- Miscellaneous Retail Stores, Cedarburg
- Miscellaneous Agriculture, Cedarburg
- Miscellaneous Government, Cedarburg
- Miscellaneous Industry, Cedarburg
- Miscellaneous Manufacturing, Cedarburg
- Miscellaneous Metal Work Manufacturers, Cedarburg
- Miscellaneous Personal Services, Cedarburg
- Miscellaneous Photographers, Cedarburg
- Miscellaneous Professional, Cedarburg
- Mortgage Bankers & Correspondents, Cedarburg
- Mortgages & Loans, Cedarburg
- Motion Picture Pre & Post Production Services, Cedarburg
- Motor Vehicle, Cedarburg
- Motor Vehicle Rental & Leasing, Cedarburg
- Motorcycle Parts, Accessories & Dealers, Cedarburg
- Movie Theaters, Cedarburg
- Moving Companies, Cedarburg
- Moving Supplies & Equipment Rental, Cedarburg
- Moving Truck Rental , Cedarburg
- Muffler Shop & Exhaust Systems, Cedarburg
- Mulch, Peat & Moss Products, Cedarburg
- Museums, Cedarburg
- Music, Cedarburg
- Musical Instruments Repair, Sales & Service, Cedarburg
- Musical Recording Services, Cedarburg
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