- Labor & Employment Consultants, Gaithersburg
- Labor Organizations, Gaithersburg
- Laboratories Dental, Gaithersburg
- Laboratories Medical, Gaithersburg
- Ladies Ready To Wear, Gaithersburg
- Land Surveyor, Gaithersburg - Land Surveying Services
- Landlord - Tenant Attorneys & Lawyers, Gaithersburg
- Landlord - Tenant Lawyers & Attorneys, Gaithersburg
- Landlord And Tenant Attorneys & Lawyers, Gaithersburg
- Landscape Contractors & Designers, Gaithersburg
- Landscape Lighting, Gaithersburg
- Landscaping, Gaithersburg
- Landscaping Materials & Supplies, Gaithersburg
- Language Schools, Gaithersburg
- Late Night Restaurants, Gaithersburg
- Laundry & Dry Cleaning Equipment & Supplies, Gaithersburg - Cleaners & Dryers Sales, Repair, Service & Leasing
- Laundry Self Service, Gaithersburg
- Lawn & Garden Equipment & Supplies, Gaithersburg
- Lawn & Garden Services, Gaithersburg
- Lawn & Garden Sprinkler Systems, Gaithersburg
- Lawn & Tree Service, Gaithersburg
- Lawn Hydroseeding, Gaithersburg
- Lawn Maintenance Services, Gaithersburg
- Lawn Mowers & Power Equipment, Gaithersburg
- Lawyers & Attorneys, Gaithersburg
- Lebanese Restaurants, Gaithersburg
- Legal & Tax Services, Gaithersburg
- Legal Professionals, Gaithersburg
- Libraries, Gaithersburg
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- Licensed Counselors, Gaithersburg
- Life Insurance, Gaithersburg
- Lifeguard Service, Gaithersburg
- Lighting Consultants, Gaithersburg
- Lighting Consultants & Designers, Gaithersburg
- Lighting Contractors, Gaithersburg
- Lighting Fixtures & Equipment, Gaithersburg
- Limousine Service, Gaithersburg
- Linens, Gaithersburg
- Linens & Towels Manufacturers, Gaithersburg
- Lingerie & Underwear for Women, Gaithersburg - Bras, Panties, Bustiers, Corsets & More
- Liquor & Beer Manufacturers, Gaithersburg
- Liquor Stores, Gaithersburg
- Live Theaters, Gaithersburg
- Livestock, Gaithersburg
- Loans Personal, Gaithersburg
- Local & Short Haul Trucking Companies, Gaithersburg
- Locks, Gaithersburg
- Locksmiths, Gaithersburg - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Gaithersburg
- Lodging, Gaithersburg
- Lodging Services, Gaithersburg
- Long Haul Trucking Companies, Gaithersburg
- Lubricating Oils , Gaithersburg - Motor Oil
- Luggage & Accessories , Gaithersburg
- Lumber & Lumber Products, Gaithersburg
- Lumber & Lumber Products, Gaithersburg
- Lumber Companies, Gaithersburg - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Gaithersburg
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