- Sand Gravel & Aggregate, Monahans
- Satellite & Cable TV Equipment & Systems Repair & Service, Monahans
- Satellite Dish Antennas & Equipment Dealers, Monahans
- Satellite TV Service, Monahans
- Scientific & Laboratory Equipment & Instruments, Monahans
- Scrap & Waste Materials, Monahans
- Security & Surveillance System & Equipment, Monahans
- Security Brokers & Dealers, Monahans
- Security Services, Monahans
- Senior Citizens Information & Services, Monahans
- Senior Citizens Service & Health Organizations, Monahans
- Septic Tanks & Septic Systems Contractors, Monahans - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Septic Tanks & Systems Contractors & Designers, Monahans
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- Service & Gas Station Equipment & Services, Monahans
- Sewer Construction Contractors, Monahans - Sewer Line, Pipe Installation & Repair Services
- Sheriff's Department, Monahans
- Shopping & Shopping Services, Monahans
- Snack Foods, Monahans
- Social Services & Welfare, Monahans
- Societies & Foundation Associations, Monahans
- Specialty Animal Services, Monahans
- Specialty Stores, Monahans
- Sprinkler System Contractors, Monahans - Garden & Lawn Sprinkler System Installation & Repair
- Staffing & Support Services, Monahans
- State Government, Monahans
- Stocks & Bond Brokers, Monahans
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