- Labor Organizations, Owosso
- Laboratories Dental, Owosso
- Laboratories Medical, Owosso
- Land Contracts Bought & Sold, Owosso
- Land Planning Services, Owosso
- Land Surveyor, Owosso - Land Surveying Services
- Landscape Contractors & Designers, Owosso
- Landscaping, Owosso
- Landscaping Materials & Supplies, Owosso
- Laser Printers, Owosso - Office Supplies
- Late Night Restaurants, Owosso
- Laundry Equipment Rental & Leasing, Owosso
- Lawn & Garden Equipment & Supplies, Owosso
- Lawn & Garden Services, Owosso
- Lawn Maintenance Services, Owosso
- Lawn Mowers & Power Equipment, Owosso
- Lawyers & Attorneys, Owosso
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- Legal Professionals, Owosso
- Libraries, Owosso
- Life Insurance, Owosso
- Liquor Stores, Owosso
- Loans Check Cashing, Owosso
- Loans Personal, Owosso
- Loans Title Services, Owosso
- Locks, Owosso
- Locksmiths, Owosso - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Owosso
- Lodging, Owosso
- Long Haul Trucking Companies, Owosso
- Lubricating Oils , Owosso - Motor Oil
- Lumber & Lumber Products, Owosso
- Lumber & Lumber Products, Owosso
- Lutheran Church, Owosso
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