- Academic, Ortonville
- Accounting, Auditing & Bookkeeping Services, Ortonville
- Adult & Geriatric Social Services, Ortonville
- Agricultural Associations, Ortonville
- Agricultural Insurance, Ortonville
- Agriculture, Ortonville
- Air Conditioning Repair & Service, Ortonville - HVAC - Cooling & Heating Repair
- Airport, Ortonville
- Ambulance Department, Ortonville
- Apartment Building Operators, Ortonville
- Apartments & Buildings, Ortonville
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- Arbitration & Mediation Services, Ortonville
- Arts & Culture, Ortonville
- Assisted Living & Elder Care Services, Ortonville
- Atm Machines, Ortonville
- Attorneys & Lawyers, Ortonville
- Attorneys & Lawyers, Ortonville
- ATV & RV Dealers, Ortonville - All-Terrain & Recreational Vehicles
- Auto Body Repair & Paint Shop, Ortonville - Auto Body Shop
- Auto Parts Stores - Used & Rebuilt, Ortonville - Truck, Car Parts, etc
- Auto Parts, Accessories, Equipment & Supplies, Ortonville
- Auto Repair Shops & Maintenance Service, Ortonville - Auto Mechanic & Car Repair Shops
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