- Savings Banks, Lowell
- Screen Printing, Lowell
- Self Defense Programs, Lowell
- Septic Tank Pumping & Cleaning, Lowell - Septic Systems
- Service Establishment Supplies & Equipment, Lowell
- Sewing Machines, Equipment & Supplies, Lowell
- Shirts & T-Shirts, Lowell
- Shopping & Shopping Services, Lowell
- Signs, Lowell
- Small Appliances, Lowell
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- Social Services & Welfare, Lowell
- Special Interest Schools Or Instruction, Lowell
- Specialty Goods Storage, Lowell
- Specialty Stores, Lowell
- Sprinkler Alarm Systems, Lowell - Fire Sprinkler Systems
- Staffing & Support Services, Lowell
- Substance Abuse Clinics, Lowell - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Swimming Pool, Sauna & Spa Contractors, Lowell
- Swimming Pools Contractors, Lowell - Install Inground - Above Ground Pools
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