- Machinery, Supplies & Equipment - Construction & Contractor Related, Grantsville
- Management Consultants & Services, Grantsville
- Manufacturing, Grantsville
- Martial Arts & Self Defense Schools, Grantsville
- Masonry Materials & Supplies, Grantsville
- Meat Market, Wholesale & Products, Grantsville
- Meat Packers, Grantsville
- Medical & Dental Management, Grantsville
- Medical Management & Business Administration Service, Grantsville
- Metal Buildings, Grantsville - Kits, Homes, Steel Buildings, etc
- Mexican Restaurants, Grantsville
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- Mini & Self Storage, Grantsville
- Miscellaneous Government, Grantsville
- Miscellaneous Personal Services, Grantsville
- Miscellaneous Professional, Grantsville
- Mobile Home Parks & Communities , Grantsville
- Mortgage Bankers & Correspondents, Grantsville
- Mortgage Companies, Grantsville
- Motor Vehicle, Grantsville
- Motor Vehicle Rental & Leasing, Grantsville
- Moving Truck Rental , Grantsville
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