- Laboratories Dental, Denham Springs
- Laboratories Medical, Denham Springs
- Ladies Ready To Wear, Denham Springs
- Land Surveyor, Denham Springs - Land Surveying Services
- Landscape Contractors & Designers, Denham Springs
- Landscaping, Denham Springs
- Laser Printers, Denham Springs - Office Supplies
- Late Night Restaurants, Denham Springs
- Lawn & Garden Equipment & Supplies, Denham Springs
- Lawn & Garden Services, Denham Springs
- Lawn & Garden Sprinkler Systems, Denham Springs
- Lawn Maintenance Services, Denham Springs
- Lawn Mower Repair & Blade Sharpening Service, Denham Springs
- Lawn Mowers & Power Equipment, Denham Springs
- Lawyers & Attorneys, Denham Springs
- Leather Goods Cleaners & Dyers, Denham Springs
- Legal & Tax Services, Denham Springs
- Legal Professionals, Denham Springs
- Libraries, Denham Springs
- Licensed Counselors, Denham Springs
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- Life Insurance, Denham Springs
- Lighting Fixtures & Equipment, Denham Springs
- Lime & Limestone, Denham Springs
- Limousine Service, Denham Springs
- Lingerie & Underwear for Women, Denham Springs - Bras, Panties, Bustiers, Corsets & More
- Liquid Waste Treatment, Denham Springs
- Liquor Stores, Denham Springs
- Loans Check Cashing, Denham Springs
- Loans Personal, Denham Springs
- Loans Title Services, Denham Springs
- Locks, Denham Springs
- Locksmiths, Denham Springs - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Denham Springs
- Lodging, Denham Springs
- Lodging Services, Denham Springs
- Logistics Freight, Denham Springs
- Long Haul Trucking Companies, Denham Springs
- Lubricating Oils , Denham Springs - Motor Oil
- Lumber & Lumber Products, Denham Springs
- Luncheonette Restaurants, Denham Springs
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