- Machine Shop & Tool Repair Service, Sheridan
- Machinery, Supplies & Equipment - Business Production Related, Sheridan
- Machinery, Supplies & Equipment - Construction & Contractor Related, Sheridan
- Manufacturing, Sheridan
- Masonry Materials & Supplies, Sheridan
- Meeting & Event Planning Services, Sheridan - Conference Consultants
- Mennonite Church, Sheridan
- Methodist Church, Sheridan
- Mexican Restaurants, Sheridan
- Mini & Self Storage, Sheridan
- Miscellaneous Household Item Repair, Sheridan
- Miscellaneous Government, Sheridan
- Miscellaneous Industry, Sheridan
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- Miscellaneous Professional, Sheridan
- Mobile Home Parks & Communities , Sheridan
- Mobile Homes, Sheridan
- Mobile Homes Manufactures, Sheridan
- Modular & Mobile Homes For Sale, Sheridan - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Sheridan
- Mortgages & Loans, Sheridan
- Motor Vehicle, Sheridan
- Motor Vehicle Rental & Leasing, Sheridan
- Moving Truck Rental , Sheridan
- Muffler Shop & Exhaust Systems, Sheridan
- Museums, Sheridan
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