- Occupational Health & Safety, Stafford
- Occupational Health Care Professionals, Stafford
- Office & Meeting Equipment & Supplies Rental, Stafford
- Office Buildings & Parks, Stafford
- Office Furniture & Equipment Rental & Leasing, Stafford
- Office Supplies, Equipment & Office Furniture Stores, Stafford
- Oil & Gas Companies, Stafford
- Oil & Gas Exploration & Development, Stafford - Oil Field Exploration, Monitoring & Remediation
- Oil & Gas Producers, Stafford - Companies
- Oil & Petroleum Products, Stafford - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Stafford - Auto Oil & Quick Lube
- Oil Field Maintenance, Stafford
- Oil Industry & Oil Field Equipment & Services, Stafford - Oil Companies
- Oil Petroleum Wholesale, Stafford
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Stafford
- Opticians, Stafford
- Optometrists, Stafford - Eye Doctors, Physicians & Surgeons (Optometry)
- Organizing Services & Products – Household & Business, Stafford
- Ornamental Greenhouses, Stafford
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- Ornamental Iron - Residential, Stafford - Wrought Iron Work Supplies, Parts, Gates, Railings, Stairs, Spirals, Fence, etc
- Ornamental Metal Work, Stafford - Steel, Iron, Bronze, etc
- Ornamental Nursery, Stafford
- Ornamental Nursery Services, Stafford
- Orthodontist, Stafford - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Stafford
- Orthopedic & Prosthetic Appliances & Shoes, Stafford - Orthopedic Shoes
- Orthotics and Prosthetics, Stafford
- Other Attorneys & Lawyers, Stafford
- Other Attorneys & Lawyers, Stafford
- Other Building Materials & Supplies, Stafford
- Other Lawyers & Attorneys, Stafford
- Other Lodging, Stafford
- Outdoor & Lawn & Garden Equipment Repair & Service, Stafford
- Outdoor Equipment & Accessories, Stafford
- Outdoor Furniture, Stafford
- Outdoor Furniture & Patio Furniture, Stafford - Garden Furniture Stores
- Overhead Door, Stafford
- Oxygen & Respiratory Equipment & Supplies, Stafford - Oxygen Concentrator, Tank, Machine, etc
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