- Labor & Employment Consultants, Frederick
- Labor And Employment Relations Attorneys & Lawyers, Frederick
- Labor And Employment Relations Lawyers & Attorneys, Frederick
- Labor Organizations, Frederick
- Laboratories Dental, Frederick
- Laboratories Medical, Frederick
- Ladies Ready To Wear, Frederick
- Laminating Services, Frederick
- Land Companies, Frederick
- Land Surveyor, Frederick - Land Surveying Services
- Landlord - Tenant Attorneys & Lawyers, Frederick
- Landlord - Tenant Lawyers & Attorneys, Frederick
- Landlord And Tenant Attorneys & Lawyers, Frederick
- Landscape Contractors & Designers, Frederick
- Landscape Design & Installation, Frederick
- Landscape Garden Services, Frederick
- Landscaping, Frederick
- Landscaping Materials & Supplies, Frederick
- Laser Hair Removal, Frederick
- Laser Printers, Frederick - Office Supplies
- Late Night Restaurants, Frederick
- Latin American Restaurants, Frederick
- Laundromats & Dry-Cleaning, Coin-Operated, Frederick
- Laundry Equipment Rental & Leasing, Frederick
- Laundry Self Service, Frederick
- Laundry Sewing & Repair, Frederick
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Frederick
- Lawn & Garden Equipment & Supplies, Frederick
- Lawn & Garden Services, Frederick
- Lawn & Garden Sprinkler Systems, Frederick
- Lawn & Tree Service, Frederick
- Lawn Hydroseeding, Frederick
- Lawn Maintenance Services, Frederick
- Lawn Mower Repair & Blade Sharpening Service, Frederick
- Lawn Mowers & Power Equipment, Frederick
- Lawn Spraying & Treatment, Frederick
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- Lawyers & Attorneys, Frederick
- Leather Goods & Luggage Repair, Frederick
- Legal & Tax Services, Frederick
- Legal Information & Referral Services, Frederick
- Legal Professionals, Frederick
- Lennox Air Conditioning, Frederick - Air Conditioner Contractors & Systems
- Libraries, Frederick
- Licensed Counselors, Frederick
- Life Insurance, Frederick
- Lighting Fixtures & Equipment, Frederick
- Lighting Fixtures Repair, Maintenance & Installation, Frederick
- Limousine Service, Frederick
- Linens, Frederick
- Lingerie & Underwear for Women, Frederick - Bras, Panties, Bustiers, Corsets & More
- Liquor & Beer Manufacturers, Frederick
- Liquor Stores, Frederick
- Live Theaters, Frederick
- Livestock, Frederick
- Livestock Breeders, Frederick
- Livestock Dealers, Frederick
- Livestock Services, Frederick
- Livestock Trailers, Frederick
- Loans Personal, Frederick
- Local & Short Haul Trucking Companies, Frederick
- Locks, Frederick
- Locksmiths, Frederick - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Frederick
- Lodging, Frederick
- Lodging Services, Frederick
- Long Haul Trucking Companies, Frederick
- Lumber & Lumber Products, Frederick
- Lumber & Lumber Products, Frederick
- Lumber & Wood Products Manufacturers, Frederick
- Lumber Companies, Frederick - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Frederick
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