- Office Machinery, Milledgeville
- Office Supplies, Equipment & Office Furniture Stores, Milledgeville
- Oil & Gas Companies, Milledgeville
- Oil & Petroleum Products, Milledgeville - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Milledgeville - Auto Oil & Quick Lube
- Oncologists, Milledgeville - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Milledgeville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Milledgeville
- Opticians, Milledgeville
- Optometrists, Milledgeville - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Milledgeville
- Ornamental Nursery Services, Milledgeville
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- Orthodontist, Milledgeville - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Milledgeville - Orthopedic Shoes
- Orthopedists, Milledgeville - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Milledgeville
- Other Lodging, Milledgeville
- Outdoor & Lawn & Garden Equipment Repair & Service, Milledgeville
- Outdoor Advertising & Billboard, Milledgeville
- Outdoor Equipment & Accessories, Milledgeville
- Outdoor Furniture & Patio Furniture, Milledgeville - Garden Furniture Stores
- Outpatient Services, Milledgeville - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Milledgeville - Oxygen Concentrator, Tank, Machine, etc
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