- Labor & Employment Consultants, Lanham
- Labor Organizations, Lanham
- Laboratories Dental, Lanham
- Laboratories Medical, Lanham
- Land Surveyor, Lanham - Land Surveying Services
- Landscape Contractors & Designers, Lanham
- Landscaping, Lanham
- Late Night Restaurants, Lanham
- Laundry & Dry Cleaning Equipment & Supplies, Lanham - Cleaners & Dryers Sales, Repair, Service & Leasing
- Laundry Self Service, Lanham
- Lawn & Garden Equipment & Supplies, Lanham
- Lawn & Garden Services, Lanham
- Lawn Maintenance Services, Lanham
- Lawn Mowers & Power Equipment, Lanham
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- Lawyers & Attorneys, Lanham
- Legal & Tax Services, Lanham
- Legal Professionals, Lanham
- Life Insurance, Lanham
- Limousine Service, Lanham
- Linen Supply Services, Lanham
- Liquor Stores, Lanham
- Livestock Trailers, Lanham
- Loans Personal, Lanham
- Locksmiths, Lanham - Residence, Commercial, Safe & Auto Car Locksmith
- Lodging, Lanham
- Lodging Services, Lanham
- Long Haul Trucking Companies, Lanham
- Lutheran Church, Lanham
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