- Salvage Yards, Junk Yards & Wrecker Service, Port Clinton
- Sandblasting, Port Clinton - General Contractors
- Sandwich Shop Restaurants, Port Clinton
- Savings & Loan Associations, Port Clinton
- Savings Banks, Port Clinton
- Scientific & Laboratory Equipment & Instruments, Port Clinton
- Screen Houses, Port Clinton
- Seafood Restaurants, Port Clinton
- Secondary Schools, Port Clinton
- Security Alarm Systems - Home & Business, Port Clinton
- Security Brokers & Dealers, Port Clinton
- Security Control Systems & Monitoring, Port Clinton - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Port Clinton
- Senior Citizens Service & Health Organizations, Port Clinton
- Sewer & Drain Cleaning & Repair, Port Clinton - Drain Cleaner & Installation Services
- Sewing & Yarn Stores & Supplies, Port Clinton
- Ship & Boat Building & Repairing, Port Clinton
- Shock Absorber, Port Clinton
- Shock Absorbers & Struts, Port Clinton
- Shopping & Shopping Services, Port Clinton
- Siding Contractors, Port Clinton - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, Port Clinton
- Skin Care & Cosmetology Salons, Port Clinton
- Skin Care Products & Treatments, Port Clinton
- Sleep Doctors, Port Clinton - Specialists, Physicians & Surgeons (Sleep Medicine)
- Small Appliances, Port Clinton
- Snack Foods, Port Clinton
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- Snacks & Desserts, Port Clinton
- Snow Removal Services, Port Clinton - Snow Plow Service
- Social Clubs & Organizations, Port Clinton
- Social Service Organizations Volunteer Services, Port Clinton
- Social Services & Welfare, Port Clinton
- Societies & Foundation Associations, Port Clinton
- Special Interest Schools Or Instruction, Port Clinton
- Specialty Goods Storage, Port Clinton
- Specialty Stores, Port Clinton
- Speech & Hearing Specialists, Port Clinton
- Speech Pathologists, Port Clinton - Speech & Language Therapy
- Sporting Goods Equipment Rental, Port Clinton
- Sporting Goods Stores, Port Clinton
- Sports & Recreational Services, Port Clinton
- Sports Bars & Lounges, Port Clinton
- Sportswear Clothing Stores, Port Clinton - Sports Clothes
- Staffing & Support Services, Port Clinton
- State Government, Port Clinton
- Steak House Restaurants, Port Clinton
- Stocks & Bond Brokers, Port Clinton
- Stoves & Furnace Equipment, Port Clinton - Fittings & Repair Parts
- Submarine Sandwich Restaurants, Port Clinton
- Substance Abuse Clinics, Port Clinton - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Surveyor Services, Port Clinton - Surveying Service
- Sushi Restaurants, Port Clinton
- Sweepers & Scrubbers Power, Port Clinton
- Swimming Pools Supplies, Equipment & Accessories, Port Clinton
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