- Office Supplies, Equipment & Office Furniture Stores, Hallettsville
- Oil & Gas Exploration & Development, Hallettsville - Oil Field Exploration, Monitoring & Remediation
- Oil & Gas Land Leases Properties & Royalties, Hallettsville
- Oil & Gas Producers, Hallettsville - Companies
- Oil & Gas Well Drilling Services, Hallettsville
- Oil & Petroleum Products, Hallettsville - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Hallettsville - Auto Oil & Quick Lube
- Oil Field Contractors, Hallettsville
- Oil Industry & Oil Field Equipment & Services, Hallettsville - Oil Companies
- Oilfield Trucking, Hallettsville
|
- Ophthalmologists, Hallettsville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Hallettsville
- Optometrists, Hallettsville - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Hallettsville
- Ornamental Nursery Products, Hallettsville
- Ornamental Nursery Services, Hallettsville
- Orthodontist, Hallettsville - Teeth Straightening, Invisalign & Dental Braces
- Other Building Materials & Supplies, Hallettsville
- Outdoor & Lawn & Garden Equipment Repair & Service, Hallettsville
|
