- Salvation Army, Stephenville
- Sand Gravel & Aggregate, Stephenville
- Sandwich Shop Restaurants, Stephenville
- Scrap & Waste Materials, Stephenville
- Secondary Schools, Stephenville
- Security Guard & Patrol Service, Stephenville - Bodyguard, Guard Dogs, Etc
- Security Services, Stephenville
- Senior Citizens Housing, Stephenville
- Senior Citizens Information & Services, Stephenville
- Sewing Contractors, Stephenville
- Shoe Stores, Stephenville - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Stephenville
- Skating Rink & Hockey Operation Services, Stephenville
- Snowmobile Dealers, Stephenville - Parts, Gear, Clothing & Accessories
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- Social Services & Welfare, Stephenville
- Societies & Foundation Associations, Stephenville
- Sound Systems, Microphones & Equipment, Stephenville
- Special Education & Care, Stephenville
- Special Interest Schools Or Instruction, Stephenville
- Speciality Food Stores, Stephenville
- Specialty Stores, Stephenville
- Sporting Goods Stores, Stephenville
- Staffing & Support Services, Stephenville
- State Government, Stephenville
- Stoves & Furnace Equipment, Stephenville - Fittings & Repair Parts
- Substance Abuse Outpatient Clinics, Stephenville
- Surveyor Services, Stephenville - Surveying Service
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