- Laboratories Medical, Monticello
- Land Surveyor, Monticello - Land Surveying Services
- Landscape Contractors & Designers, Monticello
- Landscaping, Monticello
- Laser Printers, Monticello - Office Supplies
- Laundry Self Service, Monticello
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Monticello
- Lawn & Garden Equipment & Supplies, Monticello
- Lawn & Garden Services, Monticello
- Lawn Maintenance Services, Monticello
- Lawn Mower Repair & Blade Sharpening Service, Monticello
- Lawn Mowers & Power Equipment, Monticello
- Lawyers & Attorneys, Monticello
- Legal & Tax Services, Monticello
- Legal Information & Referral Services, Monticello
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- Legal Professionals, Monticello
- Libraries, Monticello
- License Services, Monticello
- Life Insurance, Monticello
- Limousine Service, Monticello
- Liquor Stores, Monticello
- Loans Personal, Monticello
- Locks, Monticello
- Locksmiths, Monticello - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Monticello
- Lodging, Monticello
- Long Haul Trucking Companies, Monticello
- Lumber & Lumber Products, Monticello
- Lumber & Lumber Products, Monticello
- Lutheran Church, Monticello
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