- Sand Gravel & Aggregate, Crookston
- Sandwich Shop Restaurants, Crookston
- Secondary Schools, Crookston
- Security Brokers & Dealers, Crookston
- Seed & Grain Cleaning, Crookston
- Senior Citizens Service & Health Organizations, Crookston
- Sewer & Drain Cleaning & Repair, Crookston - Drain Cleaner & Installation Services
- Sewing Machine Repair & Service, Crookston
- Sharpening Service, Crookston
- Shopping & Shopping Services, Crookston
- Signs, Crookston
- Snacks & Desserts, Crookston
- Social Security And Disability Attorneys & Lawyers, Crookston
- Social Security And Disability Lawyers & Attorneys, Crookston
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- Social Services & Welfare, Crookston
- Special Dies Tools Jigs & Fixtures Manufacturers, Crookston
- Special Education & Care, Crookston
- Special Interest Schools Or Instruction, Crookston
- Special Needs Transportation, Crookston
- Specialty Stores, Crookston
- Sporting Goods Stores, Crookston
- Sports Bars & Lounges, Crookston
- Sportswear Clothing Stores, Crookston - Sports Clothes
- State Government, Crookston
- Stocks & Bond Brokers, Crookston
- Substance Abuse Clinics, Crookston - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Sugar Retail, Crookston
- Surveyor Services, Crookston - Surveying Service
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