- Laboratories Medical, Sykesville
- Land Companies, Sykesville
- Land Surveyor, Sykesville - Land Surveying Services
- Landscape Contractors & Designers, Sykesville
- Landscape Design & Installation, Sykesville
- Landscape Garden Services, Sykesville
- Landscaping, Sykesville
- Landscaping Materials & Supplies, Sykesville
- Laundry Self Service, Sykesville
- Lawn & Garden Consultants, Sykesville
- Lawn & Garden Equipment & Supplies, Sykesville
- Lawn & Garden Services, Sykesville
- Lawn Maintenance Services, Sykesville
- Lawn Mower Repair & Blade Sharpening Service, Sykesville
- Lawn Mowers & Power Equipment, Sykesville
- Lawn Spraying & Treatment, Sykesville
- Lawyers & Attorneys, Sykesville
- Legal Professionals, Sykesville
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- Libraries, Sykesville
- Life Insurance, Sykesville
- Lighting Fixtures & Equipment, Sykesville
- Limousine Service, Sykesville
- Lions Clubs, Sykesville
- Liquor Stores, Sykesville
- Livestock, Sykesville
- Livestock Trailers, Sykesville
- Loans Personal, Sykesville
- Locks, Sykesville
- Locksmiths, Sykesville - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Sykesville
- Lodging, Sykesville
- Long Haul Trucking Companies, Sykesville
- Lumber & Lumber Products, Sykesville
- Lumber & Lumber Products, Sykesville
- Lutheran Church, Sykesville
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