- Labor & Employment Consultants, Southampton
- Laboratories Medical, Southampton
- Lakes & Ponds Construction Maintenance Restoration & Control, Southampton
- Land Companies, Southampton
- Land Planning Services, Southampton
- Land Surveyor, Southampton - Land Surveying Services
- Land Use & Zoning Attorneys & Lawyers, Southampton
- Landscape Contractors & Designers, Southampton
- Landscape Garden Services, Southampton
- Landscape Lighting, Southampton
- Landscaping, Southampton
- Landscaping Materials & Supplies, Southampton
- Latin American Restaurants, Southampton
- Laundry Self Service, Southampton
- Lawn & Garden Consultants, Southampton
- Lawn & Garden Equipment & Supplies, Southampton
- Lawn & Garden Services, Southampton
- Lawn & Garden Sprinkler Systems, Southampton
- Lawn Furnishings, Southampton
- Lawn Maintenance Services, Southampton
- Lawn Mower Repair & Blade Sharpening Service, Southampton
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- Lawn Spraying & Treatment, Southampton
- Lawyers & Attorneys, Southampton
- Legal & Tax Services, Southampton
- Legal Professionals, Southampton
- Libraries, Southampton
- Licensed Counselors, Southampton
- Lighting Consultants & Designers, Southampton
- Lighting Fixtures & Equipment, Southampton
- Limousine Service, Southampton
- Lingerie & Underwear for Women, Southampton - Bras, Panties, Bustiers, Corsets & More
- Liquor Stores, Southampton
- Loans Personal, Southampton
- Locks, Southampton
- Locksmiths, Southampton - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Southampton
- Lodging, Southampton
- Lodging Services, Southampton
- Long Haul Trucking Companies, Southampton
- Lubricating Oils , Southampton - Motor Oil
- Lumber & Lumber Products, Southampton
- Lumber & Lumber Products, Southampton
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