- Salvage Yards, Junk Yards & Wrecker Service, Mifflintown
- Sand Gravel & Aggregate, Mifflintown
- Sandwich Shop Restaurants, Mifflintown
- Screen Printing, Mifflintown
- Sealcoating, Mifflintown - Asphalt Sealcoating & Paving
- Security Alarm Systems - Home & Business, Mifflintown
- Security Control Systems & Monitoring, Mifflintown - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Mifflintown
- Senior Citizens Service & Health Organizations, Mifflintown
- Sheriff's Department, Mifflintown
- Shopping & Shopping Services, Mifflintown
- Signs, Mifflintown
- Skating Rink & Hockey Operation Services, Mifflintown
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- Social Services & Welfare, Mifflintown
- Social Workers & Services, Mifflintown
- Specialty Animal Services, Mifflintown
- Specialty Stores, Mifflintown
- Sporting Goods Equipment Rental, Mifflintown
- Sporting Goods Stores, Mifflintown
- State Government, Mifflintown
- Stereo, Audio & Video Equipment Dealers & Stores, Mifflintown
- Storm Doors & Windows, Mifflintown
- Stove, Oven, Range & Cooktop Parts & Supplies, Mifflintown
- Stoves & Furnace Equipment, Mifflintown - Fittings & Repair Parts
- Surveyor Services, Mifflintown - Surveying Service
- Swimming Pools Supplies, Equipment & Accessories, Mifflintown
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