- Labor & Employment Consultants, Peterborough
- Labor Organizations, Peterborough
- Labor Unions, Peterborough
- Laboratories Dental, Peterborough
- Laboratories Medical, Peterborough
- Laboratory Equipment Repair & Service, Peterborough
- Laminating Services, Peterborough
- Lamp Shades, Peterborough
- Lamps & Lamp Shades Retail, Peterborough - Desk, Table & Floor Lamps
- Land Surveyor, Peterborough - Land Surveying Services
- Landscape Contractors & Designers, Peterborough
- Landscaping, Peterborough
- Landscaping Materials & Supplies, Peterborough
- Laser Equipment Repair & Service, Peterborough
- Laser Therapy Clinics, Peterborough
- Laundromats & Dry-Cleaning, Coin-Operated, Peterborough
- Laundry & Dry Cleaning Equipment & Supplies, Peterborough - Cleaners & Dryers Sales, Repair, Service & Leasing
- Lawn & Garden Decor & Ornaments, Peterborough
- Lawn & Garden Equipment & Supplies, Peterborough
- Lawn & Garden Services, Peterborough
- Lawn & Garden Sprinkler Systems, Peterborough
- Lawn Furnishings, Peterborough
- Lawn Maintenance Services, Peterborough
- Lawn Mowers & Power Equipment, Peterborough
- Lawn Ornaments & Decorations, Peterborough
- Lawyers & Attorneys, Peterborough
- Leather Apparel Goods Manufacturers, Peterborough
- Leather Goods, Peterborough
- Leather Goods Cleaners & Dyers, Peterborough
- Leather Goods Stores & Dealers, Peterborough
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- Legal & Tax Services, Peterborough
- Legal Information & Referral Services, Peterborough
- Legal Professionals, Peterborough
- Letter Signs, Peterborough
- Libraries, Peterborough
- Life Insurance, Peterborough
- Lift Trucks, Peterborough
- Lighting Fixtures & Equipment, Peterborough
- Limousine Service, Peterborough
- Linen Supply Services, Peterborough
- Lingerie & Underwear for Women, Peterborough - Bras, Panties, Bustiers, Corsets & More
- Liquid Transportation - Non Hazardous, Peterborough
- Liquor Stores, Peterborough
- Live Theaters, Peterborough
- Livestock, Peterborough
- Loans Personal, Peterborough
- Local & Short Haul Trucking Companies, Peterborough
- Locks, Peterborough
- Locksmiths, Peterborough - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Peterborough
- Lodging, Peterborough
- Long Haul Trucking Companies, Peterborough
- Lubricating Oils , Peterborough - Motor Oil
- Lubricating Oils & Greases, Peterborough
- Luggage & Accessories , Peterborough
- Lumber & Lumber Products, Peterborough
- Lumber & Lumber Products, Peterborough
- Lumber & Wood Products Manufacturers, Peterborough
- Lumber Companies, Peterborough - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Peterborough
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