- Sales & Marketing Consultant, Houlton
- Salvation Army, Houlton
- Sand Gravel & Aggregate, Houlton
- Sandwich Shop Restaurants, Houlton
- Satellite & Cable TV Equipment & Systems, Houlton
- Satellite TV Service, Houlton
- Scientific Equipment & Services, Houlton
- Scientific Services, Houlton
- Seafood Restaurants, Houlton
- Secondary Schools, Houlton
- Senior Citizens Information & Services, Houlton
- Septic Tank Installation & Repair, Houlton - Septic Systems
- Septic Tank Pumping & Cleaning, Houlton - Septic Systems
- Septic Tanks & Septic Systems Contractors, Houlton - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Sheet Metal, Houlton
- Sheet Metal Work - Aluminum, Tin, Stainless Steel, etc, Houlton - Sheet Metal Products
- Shoe Repair Shops, Houlton
- Shoe Stores, Houlton - Mens, Womens & Kids Shoes
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- Shopping & Shopping Services, Houlton
- Snacks & Desserts, Houlton
- Snowmobile Dealers, Houlton - Parts, Gear, Clothing & Accessories
- Social Service Organizations Mental Health Services, Houlton
- Social Service Organizations Volunteer Services, Houlton
- Social Services & Welfare, Houlton
- Societies & Foundation Associations, Houlton
- Special Education & Care, Houlton
- Special Interest Schools Or Instruction, Houlton
- Special Needs Transportation, Houlton
- Specialty Stores, Houlton
- Sporting Goods Stores, Houlton
- Sportswear Clothing Stores, Houlton - Sports Clothes
- Staffing & Support Services, Houlton
- State Government, Houlton
- Substance Abuse Clinics, Houlton - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Support Services, Houlton
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