- Office Equipment & Supplies Manufacturers, Pewaukee
- Office Supplies, Equipment & Office Furniture Stores, Pewaukee
- Offset & Photolithographic Printing, Pewaukee
- Oil Change & Lubrication, Pewaukee - Auto Oil & Quick Lube
- Oil Field Services Mud Disposal & Jacking, Pewaukee
- Oil Industry & Oil Field Equipment & Services, Pewaukee - Oil Companies
- Ophthalmologists, Pewaukee - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Pewaukee
- Opticians, Pewaukee
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- Optometrists, Pewaukee - Eye Doctors, Physicians & Surgeons (Optometry)
- Orchestras, Symphonies & Bands, Pewaukee
- Orthodontist, Pewaukee - Teeth Straightening, Invisalign & Dental Braces
- Other Building Materials & Supplies, Pewaukee
- Other Electrical Products, Pewaukee
- Otolaryngologists, Pewaukee - Ear, Nose, Throat - ENT Doctors, Physicians & Surgeons (Otolaryngology)
- Outdoor Advertising & Billboard, Pewaukee
- Ownership Organizations, Pewaukee
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