- Laboratories Dental, Chelsea
- Laboratories Medical, Chelsea
- Land Surveyor, Chelsea - Land Surveying Services
- Landscape Contractors & Designers, Chelsea
- Landscaping, Chelsea
- Latin American Restaurants, Chelsea
- Laundry Equipment Rental & Leasing, Chelsea
- Laundry Self Service, Chelsea
- Lawyers & Attorneys, Chelsea
- Lead Paint Testing, Detection & Removal, Chelsea
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- Legal Professionals, Chelsea
- Lighting Fixtures & Equipment, Chelsea
- Limousine Service, Chelsea
- Liquor Stores, Chelsea
- Locksmiths, Chelsea - Residence, Commercial, Safe & Auto Car Locksmith
- Lodging, Chelsea
- Lodging Services, Chelsea
- Logistics Freight, Chelsea
- Long Haul Trucking Companies, Chelsea
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