- Obstetricians & Gynecologists, Cedarburg - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Off Road Vehicles, Cedarburg
- Off Road Vehicles Parts & Accessories, Cedarburg
- Office Buildings & Parks, Cedarburg
- Office Supplies, Equipment & Office Furniture Stores, Cedarburg
- Oil & Gas Companies, Cedarburg
- Oil Change & Lubrication, Cedarburg - Auto Oil & Quick Lube
- Oncologists, Cedarburg - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Cedarburg - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Cedarburg
- Opticians, Cedarburg
- Optometrists, Cedarburg - Eye Doctors, Physicians & Surgeons (Optometry)
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- Orchard Service, Cedarburg
- Ornamental Nursery, Cedarburg
- Ornamental Nursery Services, Cedarburg
- Orthodontist, Cedarburg - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Cedarburg
- Orthopedists, Cedarburg - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Cedarburg
- Other Electrical Products, Cedarburg
- Outdoor Equipment & Accessories, Cedarburg
- Outpatient Services, Cedarburg - Outpatient Care
- Overhead Door, Cedarburg
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