- Office Supplies, Equipment & Office Furniture Stores, Nevada City
- Oil Change & Lubrication, Nevada City - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Nevada City - Oil Companies
- Opera Companies, Nevada City
- Orchestras, Symphonies & Bands, Nevada City
- Oriental Rugs, Nevada City
- Ornamental Iron Work, Nevada City
- Ornamental Nursery, Nevada City
- Ornamental Nursery Services, Nevada City
- Orthodontist, Nevada City - Teeth Straightening, Invisalign & Dental Braces
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- Orthopedic & Prosthetic Appliances & Shoes, Nevada City - Orthopedic Shoes
- Other Attorneys & Lawyers, Nevada City
- Other Attorneys & Lawyers, Nevada City
- Other Building Materials & Supplies, Nevada City
- Other Lawyers & Attorneys, Nevada City
- Other Lodging, Nevada City
- Outdoor & Lawn & Garden Equipment Repair & Service, Nevada City
- Outerwear Stores, Nevada City - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Overhead Door, Nevada City
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