- Machine Shop, Montevideo
- Machine Shop & Tool Repair Service, Montevideo
- Machinery, Supplies & Equipment - Business Production Related, Montevideo
- Machinery, Supplies & Equipment - Business Supplies Related, Montevideo
- Mailing, Delivery & Courier Service, Montevideo
- Maintenance, Cleaning & Sanitation, Montevideo
- Major Appliances, Montevideo - Household & Kitchen
- Manufacturing, Montevideo
- Marriage & Family Counselors, Montevideo
- Masonry Materials & Supplies, Montevideo
- Massage Therapists & Professional, Montevideo
- Massage Therapy, Montevideo
- Mats & Matting, Montevideo
- Meat Market, Wholesale & Products, Montevideo
- Medical Supplies & Equipment, Montevideo
- Membership Sports & Recreation Clubs, Montevideo
- Mental Health Specialists, Montevideo - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Montevideo
- Mexican Restaurants, Montevideo
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- Miscellaneous Business Services, Montevideo
- Miscellaneous Government, Montevideo
- Miscellaneous Industry, Montevideo
- Miscellaneous Manufacturing, Montevideo
- Miscellaneous Personal Services, Montevideo
- Miscellaneous Photographers, Montevideo
- Miscellaneous Professional, Montevideo
- Mobile Homes, Montevideo
- Mobile Homes Manufactures, Montevideo
- Mortgage Bankers & Correspondents, Montevideo
- Mortgage Contracts & Services, Montevideo
- Motor Vehicle, Montevideo
- Motor Vehicle Rental & Leasing, Montevideo
- Motorcycle & ATV Repair & Service, Montevideo
- Motorcycle & Motor Scooters Dealers, Repair & Service, Montevideo
- Motorcycle Repair & Service, Montevideo
- Movie Theaters, Montevideo
- Moving Supplies & Equipment Rental, Montevideo
- Moving Truck Rental , Montevideo
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