- Nail Salons, Simpsonville
- National Government, Simpsonville
- Natural Gas Brokers, Simpsonville
- Nephrologists, Simpsonville - Kidney Doctors, Physicians & Surgeons (Nephrology)
- Network Communications, Simpsonville
- Newspaper Manufacturers, Simpsonville
- Night Clubs, Simpsonville - Nightclub & Night Life
- Non-Denominational Churches, Simpsonville
- Noncommercial Research Organizations, Simpsonville
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