Businesses and Occupations
- Northwest Airlines Inc
- Northwestern Mutual Life Insurance Company
- Novell Inc
- NTN Corp
- Nu Skin Enterprises Inc
- Nucor Corp
- Numeration systems
- Oakley Inc
- Occidental Petroleum Corp
- Ocean Spray Cranberries Inc
- OCharleys Inc
- OD
- office
- Office Depot Inc
- Office Technology
- OfficeMax Inc
- Offshore assembly industry
- Ogden Corp
- Oil Industry
- Oil-Dri Corp. of America