- Obstetricians & Gynecologists, Appleton - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Appleton
- Occupational Health Care Physicians & Surgeons, Appleton - Occupational Medicine
- Occupational Health Care Professionals, Appleton
- Occupational Medicine Doctors, Appleton - Physicians & Surgeons
- Occupational Therapy, Appleton - Occupational Health Specialists
- Off Road Vehicles, Appleton
- Off Road Vehicles Parts & Accessories, Appleton
- Office Buildings & Parks, Appleton
- Office Equipment & Supplies Manufacturers, Appleton
- Office Supplies, Equipment & Office Furniture Stores, Appleton
- Offset Printing, Appleton
- Oil & Gas Companies, Appleton
- Oil & Petroleum Products, Appleton - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Appleton - Auto Oil & Quick Lube
- Oil Field Services Mud Disposal & Jacking, Appleton
- Oil Industry & Oil Field Equipment & Services, Appleton - Oil Companies
- Oil Synthetic, Appleton
- Oils Industrial, Appleton
- Old Age Homes Service, Appleton
- Oncologists, Appleton - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Appleton - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Appleton
- Opticians, Appleton
- Optometrists, Appleton - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Appleton - Dentists - Oral & Maxillofacial Surgeons
- Orchard Service, Appleton
- Orchestras, Symphonies & Bands, Appleton
- Oriental Goods & Products Stores, Appleton
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- Oriental Massage, Appleton
- Oriental Rugs, Appleton
- Ornamental Greenhouses, Appleton
- Ornamental Metal Work, Appleton - Steel, Iron, Bronze, etc
- Ornamental Nursery, Appleton
- Ornamental Nursery Services, Appleton
- Orthodontist, Appleton - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Appleton
- Orthopedic & Prosthetic Appliances & Shoes, Appleton - Orthopedic Shoes
- Orthopedic Shoes, Appleton
- Orthopedists, Appleton - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Appleton
- Other Attorneys & Lawyers, Appleton
- Other Building Materials & Supplies, Appleton
- Other Electrical Products, Appleton
- Other Lawyers & Attorneys, Appleton
- Other Lodging, Appleton
- Outboard Motors Parts & Repair, Appleton
- Outdoor & Lawn & Garden Equipment Repair & Service, Appleton
- Outdoor Equipment & Accessories, Appleton
- Outdoor Furniture & Patio Furniture, Appleton - Garden Furniture Stores
- Outerwear Stores, Appleton - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Clinics, Appleton - Care & Treatment Centers
- Outpatient Services, Appleton - Outpatient Care
- Outplacement Consultants, Appleton
- Outplacement Counseling, Appleton
- Overhead Door, Appleton
- Ownership Organizations, Appleton
- Oxygen & Respiratory Equipment & Supplies, Appleton - Oxygen Concentrator, Tank, Machine, etc
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