- Sandwich Shop Restaurants, Hallowell
- Satellite Dish Antennas & Equipment Dealers, Hallowell
- Satellite TV Service, Hallowell
- Scientific Equipment & Services, Hallowell
- Scientific Services, Hallowell
- Scrap & Waste Machinery, Hallowell
- Scrap & Waste Materials, Hallowell
- Seafood Restaurants, Hallowell
- Security Alarm Systems - Home & Business, Hallowell
- Security Control Systems & Monitoring, Hallowell - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Hallowell
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- Shopping & Shopping Services, Hallowell
- Siding Contractors, Hallowell - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, Hallowell
- Skating Rink & Hockey Operation Services, Hallowell
- Social Service Organizations Mental Health Services, Hallowell
- Social Services & Welfare, Hallowell
- Societies & Foundation Associations, Hallowell
- Specialty Stores, Hallowell
- Sporting Goods Stores, Hallowell
- Stamp Collecting & Coin Dealers , Hallowell
- State Government, Hallowell
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