- Safety Equipment & Supplies, Watford City
- Sand Gravel & Aggregate, Watford City
- Seafood Restaurants, Watford City
- Security Brokers & Dealers, Watford City
- Seed & Grain Cleaning, Watford City
- Senior Citizens Service & Health Organizations, Watford City
- Septic Tank Installation & Repair, Watford City - Septic Systems
- Septic Tank Pumping & Cleaning, Watford City - Septic Systems
- Septic Tanks & Septic Systems Contractors, Watford City - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Sewing & Yarn Stores & Supplies, Watford City
- Sewing Ribbons, Watford City
- Shoe Store - More, Watford City
- Shoe Stores, Watford City - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Watford City
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- Snow Removal Services, Watford City - Snow Plow Service
- Social Clubs & Organizations, Watford City
- Social Services & Welfare, Watford City
- Special Interest Schools Or Instruction, Watford City
- Specialty Stores, Watford City
- Sporting Goods Stores, Watford City
- Staffing & Support Services, Watford City
- State Government, Watford City
- Structural Engineer, Watford City
- Substance Abuse Clinics, Watford City - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Surveyor Services, Watford City - Surveying Service
- Surveyors, Watford City
- Swimming Pools, Watford City
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