- Labels & Tags, Catonsville
- Labor Organizations, Catonsville
- Laboratories Dental, Catonsville
- Laboratories Medical, Catonsville
- Land Surveyor, Catonsville - Land Surveying Services
- Landscape Contractors & Designers, Catonsville
- Landscaping, Catonsville
- Laundry Equipment Rental & Leasing, Catonsville
- Laundry Self Service, Catonsville
- Lawn & Garden Equipment & Supplies, Catonsville
- Lawn & Garden Services, Catonsville
- Lawn Maintenance Services, Catonsville
- Lawn Mower Repair & Blade Sharpening Service, Catonsville
- Lawyers & Attorneys, Catonsville
- Lead Inspection, Testing & Consulting, Catonsville - Lead Paint
- Legal & Tax Services, Catonsville
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- Legal Information & Referral Services, Catonsville
- Legal Professionals, Catonsville
- License Services, Catonsville
- Licensed Counselors, Catonsville
- Life Insurance, Catonsville
- Limousine Service, Catonsville
- Lingerie & Underwear for Women, Catonsville - Bras, Panties, Bustiers, Corsets & More
- Liquor Stores, Catonsville
- Loans Personal, Catonsville
- Locks, Catonsville
- Locksmiths, Catonsville - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Catonsville
- Lodging, Catonsville
- Lodging Services, Catonsville
- Long Haul Trucking Companies, Catonsville
- Lutheran Church, Catonsville
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