- Occupational Health Care Physicians & Surgeons, Brookfield - Occupational Medicine
- Occupational Health Care Professionals, Brookfield
- Occupational Medicine Doctors, Brookfield - Physicians & Surgeons
- Occupational Therapy, Brookfield - Occupational Health Specialists
- Office Buildings & Parks, Brookfield
- Office Supplies, Equipment & Office Furniture Stores, Brookfield
- Oil Change & Lubrication, Brookfield - Auto Oil & Quick Lube
- Oil Extraction Downhole, Brookfield
- Oil Industry & Oil Field Equipment & Services, Brookfield - Oil Companies
- Online Advertising, Brookfield - Internet Advertising
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Brookfield
- Opticians, Brookfield
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- Optometrists, Brookfield - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Brookfield - Dentists - Oral & Maxillofacial Surgeons
- Organizing Services & Products – Household & Business, Brookfield
- Ornamental Iron - Residential, Brookfield - Wrought Iron Work Supplies, Parts, Gates, Railings, Stairs, Spirals, Fence, etc
- Ornamental Metal Work, Brookfield - Steel, Iron, Bronze, etc
- Ornamental Nursery, Brookfield
- Ornamental Nursery Services, Brookfield
- Orthodontist, Brookfield - Teeth Straightening, Invisalign & Dental Braces
- Other Building Materials & Supplies, Brookfield
- Outdoor Equipment & Accessories, Brookfield
- Ownership Organizations, Brookfield
- Oxygen & Respiratory Equipment & Supplies, Brookfield - Oxygen Concentrator, Tank, Machine, etc
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