- Labeling Equipment & Supplies, South Portland
- Labels & Tags, South Portland
- Labor & Employment Consultants, South Portland
- Labor Organizations, South Portland
- Laboratories Dental, South Portland
- Laboratories Medical, South Portland
- Ladder & Lift Equipment & Machine Rental, South Portland
- Ladies Ready To Wear, South Portland
- Lamp Repair, South Portland
- Landscape Contractors & Designers, South Portland
- Landscaping, South Portland
- Landscaping Materials & Supplies, South Portland
- Late Night Restaurants, South Portland
- Laundry Self Service, South Portland
- Lawn & Garden Equipment & Supplies, South Portland
- Lawn & Garden Services, South Portland
- Lawn & Garden Sprinkler Systems, South Portland
- Lawn Maintenance Services, South Portland
- Lawyers & Attorneys, South Portland
- Leather Goods Cleaners & Dyers, South Portland
- Legal & Tax Services, South Portland
- Legal Professionals, South Portland
- Licensed Counselors, South Portland
- Life Insurance, South Portland
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- Lighting Consultants & Designers, South Portland
- Lighting Fixtures Repair, Maintenance & Installation, South Portland
- Limousine Service, South Portland
- Linen Supply Services, South Portland
- Linens, South Portland
- Lingerie & Underwear for Women, South Portland - Bras, Panties, Bustiers, Corsets & More
- Liquor Stores, South Portland
- Live Theaters, South Portland
- Livestock, South Portland
- Livestock Dealers, South Portland
- Livestock Trailers, South Portland
- Living Room Furniture, South Portland
- Loading Dock Equipment, South Portland
- Loans Personal, South Portland
- Locks, South Portland
- Locksmiths, South Portland - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, South Portland
- Lodging, South Portland
- Lodging Services, South Portland
- Long Haul Trucking Companies, South Portland
- Lumber & Lumber Products, South Portland
- Lumber & Lumber Products, South Portland
- Lumber Companies, South Portland - Wholesale, Manufacturers & Suppliers
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