- Tdd & Tty Telephone Services, Oroville
- Technological Research & Development, Oroville
- Telecommunications Companies, Businesses & Services, Oroville
- Telephone Services Tdd & Tty Telephone Relay Service, Oroville
- Thrift Stores, Resale & Consignment Shops, Oroville
- Tire Retread, Regroove & Repair Equipment, Oroville
- Tires - Wholesale & Retail, Oroville
- Tools & Hardware Supplies, Oroville
- Tourist Attractions, Oroville
- Trailer Rental & Leasing, Oroville
- Transportation, Oroville
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- Transportation & Traffic Consultants & Services, Oroville - Transportation Brokers & Consultants
- Transportation Equipment Manufacturers, Oroville
- Transportation Facilities & Services, Oroville
- Transportation Rental & Leasing, Oroville
- Transportation Repair & Maintenance, Oroville
- Travel & Tourism, Oroville
- Trinity Church, Oroville
- Trucking - Garbage, Refuse, Waste, Trash, Scrap & Junk Removal, Oroville - Collection, Removal, Disposal, Recycling, etc
- Trucking Bureaus, Oroville
- TV & Radio Advertising, Oroville - TV Commercials, Radio Stations ads, etc
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