- Labor Organizations, Arnprior
- Land Surveyor, Arnprior - Land Surveying Services
- Landscape Contractors & Designers, Arnprior
- Landscaping, Arnprior
- Laundromats & Dry-Cleaning, Coin-Operated, Arnprior
- Lawn & Garden Decor & Ornaments, Arnprior
- Lawn Furnishings, Arnprior
- Lawn Ornaments & Decorations, Arnprior
- Lawyers & Attorneys, Arnprior
- Legal Professionals, Arnprior
- Libraries, Arnprior
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- License & Registry Services, Arnprior
- Life Insurance, Arnprior
- Liquor Stores, Arnprior
- Live Theaters, Arnprior
- Locks, Arnprior
- Locksmiths, Arnprior - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Arnprior
- Lodging, Arnprior
- Long Haul Trucking Companies, Arnprior
- Lubricating Oils , Arnprior - Motor Oil
- Lutheran Church, Arnprior
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