- Office Supplies, Equipment & Office Furniture Stores, New Ulm
- Oil & Gas Companies, New Ulm
- Ophthalmologists, New Ulm - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Opticians, New Ulm
- Optometrists, New Ulm - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, New Ulm - Eye Clinics
- Oral Surgeon, New Ulm - Dentists - Oral & Maxillofacial Surgeons
- Orchard Service, New Ulm
- Ornamental Metal Work, New Ulm - Steel, Iron, Bronze, etc
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- Ornamental Nursery, New Ulm
- Ornamental Nursery Products, New Ulm
- Ornamental Nursery Services, New Ulm
- Orthodontist, New Ulm - Teeth Straightening, Invisalign & Dental Braces
- Other Building Materials & Supplies, New Ulm
- Other Electrical Products, New Ulm
- Other Lodging, New Ulm
- Outboard Motors, New Ulm
- Outdoor Equipment & Accessories, New Ulm
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