- Laboratories Dental, Montrose
- Laboratories Medical, Montrose
- Land Surveyor, Montrose - Land Surveying Services
- Landscape Contractors & Designers, Montrose
- Landscape Garden Equipment, Montrose
- Landscape Lighting, Montrose
- Landscaping, Montrose
- Landscaping Materials & Supplies, Montrose
- Laser Printers, Montrose - Office Supplies
- Late Night Restaurants, Montrose
- Laundries Full Service Commercial, Montrose
- Laundry Self Service, Montrose
- Lawn & Garden Equipment & Supplies, Montrose
- Lawn & Garden Services, Montrose
- Lawn & Garden Sprinkler Systems, Montrose
- Lawn Maintenance Services, Montrose
- Lawn Mower Repair & Blade Sharpening Service, Montrose
- Lawn Mowers & Power Equipment, Montrose
- Lawyers & Attorneys, Montrose
- Legal & Tax Services, Montrose
- Legal Information & Referral Services, Montrose
- Legal Professionals, Montrose
- Libraries, Montrose
- Life Insurance, Montrose
- Lighting Consultants & Designers, Montrose
- Lighting Fixtures Repair, Maintenance & Installation, Montrose
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- Limousine Service, Montrose
- Linen Supply Services, Montrose
- Liquid Waste Treatment, Montrose
- Liquor & Beer Manufacturers, Montrose
- Liquor Stores, Montrose
- Live Theaters, Montrose
- Livestock, Montrose
- Livestock Dealers, Montrose
- Livestock Equipment & Supplies, Montrose
- Livestock Trailers, Montrose
- Living Word Church, Montrose
- Loans Personal, Montrose
- Locks, Montrose
- Locksmiths, Montrose - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Montrose
- Lodging, Montrose
- Lodging Services, Montrose
- Log & Lumber Hauling, Montrose
- Log Homes - Log Cabins Builders, Montrose - Building Contractors
- Long Haul Trucking Companies, Montrose
- Lubricating Oils , Montrose - Motor Oil
- Lumber & Lumber Products, Montrose
- Lumber & Lumber Products, Montrose
- Lumber Companies, Montrose - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Montrose
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