- Sand Gravel & Aggregate, Conneaut Lake
- Sandwich Shop Restaurants, Conneaut Lake
- Savings & Loan Associations, Conneaut Lake
- Savings Banks, Conneaut Lake
- Scientific & Laboratory Equipment & Instruments, Conneaut Lake
- Screen Houses, Conneaut Lake
- Seafood Restaurants, Conneaut Lake
- Secondary Schools, Conneaut Lake
- Sewage Systems, Conneaut Lake
- Sewer & Drain Cleaning & Repair, Conneaut Lake - Drain Cleaner & Installation Services
- Shopping & Shopping Services, Conneaut Lake
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- Signs, Conneaut Lake
- Social Services & Welfare, Conneaut Lake
- Societies & Foundation Associations, Conneaut Lake
- Special Dies Tools Jigs & Fixtures Manufacturers, Conneaut Lake
- Specialty Stores, Conneaut Lake
- Specialty Vehicle Rental & Leasing, Conneaut Lake
- Steak House Restaurants, Conneaut Lake
- Storm Doors & Windows, Conneaut Lake
- Stoves & Furnace Equipment, Conneaut Lake - Fittings & Repair Parts
- Substance Abuse Clinics, Conneaut Lake - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Surveyor Services, Conneaut Lake - Surveying Service
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