- Obstetricians & Gynecologists, Milwaukee - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Milwaukee
- Occupational Health Care Professionals, Milwaukee
- Occupational Rehabilitation, Milwaukee
- Occupational Therapy, Milwaukee - Occupational Health Specialists
- Off Road Vehicles, Milwaukee
- Off Road Vehicles Parts & Accessories, Milwaukee
- Office Buildings & Parks, Milwaukee
- Office Partitions & Dividers, Milwaukee
- Office Space on Rent, Milwaukee - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Milwaukee
- Oil & Gas Additives & Supplies, Milwaukee
- Oil & Gas Companies, Milwaukee
- Oil & Gas Exploration & Development, Milwaukee - Oil Field Exploration, Monitoring & Remediation
- Oil & Petroleum Products, Milwaukee - Merchant, Wholesalers, etc
- Oil And Petroleum Products, Milwaukee
- Oil Change & Lubrication, Milwaukee - Auto Oil & Quick Lube
- Oil Field Services Mud Disposal & Jacking, Milwaukee
- Oil Industry & Oil Field Equipment & Services, Milwaukee - Oil Companies
- Old Age Homes Service, Milwaukee
- Oncologists, Milwaukee - Cancer Doctors, Physicians & Surgeons (Oncology)
- Opera Companies, Milwaukee
- Ophthalmologists, Milwaukee - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Manufacturers, Milwaukee
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Milwaukee
- Opticians, Milwaukee
- Optometrists, Milwaukee - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Milwaukee - Eye Clinics
- Oral Surgeon, Milwaukee - Dentists - Oral & Maxillofacial Surgeons
- Orchestras, Symphonies & Bands, Milwaukee
- Organ Donation & Tissue Banks, Milwaukee
- Organizing Services & Products – Household & Business, Milwaukee
- Organs Tuning & Repair, Milwaukee
- Oriental Restaurants, Milwaukee
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- Oriental Rugs, Milwaukee
- Ornamental Greenhouses, Milwaukee
- Ornamental Metal Work, Milwaukee - Steel, Iron, Bronze, etc
- Ornamental Nursery, Milwaukee
- Ornamental Nursery Products, Milwaukee
- Ornamental Nursery Services, Milwaukee
- Orthodontist, Milwaukee - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Synagogues, Milwaukee
- Orthopedic & Prosthetic Appliances & Shoes, Milwaukee - Orthopedic Shoes
- Orthopedic Shoes, Milwaukee
- Orthopedists, Milwaukee - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Milwaukee
- Osteoporosis Doctors, Milwaukee - Physicians & Surgeons
- Other Attorneys & Lawyers, Milwaukee
- Other Attorneys & Lawyers, Milwaukee
- Other Building Materials & Supplies, Milwaukee
- Other Lawyers & Attorneys, Milwaukee
- Other Lodging, Milwaukee
- Otolaryngologists, Milwaukee - Ear, Nose, Throat - ENT Doctors, Physicians & Surgeons (Otolaryngology)
- Outboard Motors Parts & Repair, Milwaukee
- Outdoor & Lawn & Garden Equipment Repair & Service, Milwaukee
- Outdoor Advertising & Billboard, Milwaukee
- Outdoor Centers, Milwaukee
- Outdoor Equipment & Accessories, Milwaukee
- Outdoor Furniture & Patio Furniture, Milwaukee - Garden Furniture Stores
- Outdoor Power Equipment Repair, Milwaukee
- Outerwear Stores, Milwaukee - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Clinics, Milwaukee - Care & Treatment Centers
- Outpatient Services, Milwaukee - Outpatient Care
- Outplacement Consultants, Milwaukee
- Outplacement Counseling, Milwaukee
- Overhead Door, Milwaukee
- Ownership Organizations, Milwaukee
- Oxygen & Respiratory Equipment & Supplies, Milwaukee - Oxygen Concentrator, Tank, Machine, etc
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