- Tanning Salons, Oakland
- Tarps, Oakland - Tarpaulins
- Tattooing, Oakland
- Tax Return Preparation, Oakland
- Tennis Equipment & Supplies Stores, Oakland - Racquets, Shoes, Balls, Bags, Clothing & Accessories
- Tents, Canopies & Awnings, Oakland
- Terrazzo Tile Marble & Mosaic Contractors, Oakland
- Theater & Sport Ticket Agencies, Oakland
- Therapeutic Massage Clinics, Oakland - Massage Therapy Centers
- Therapists & Therapy Services, Oakland
- Thrift Stores, Resale & Consignment Shops, Oakland
- Tile Contractors - Install & Repair, Oakland - Ceramic & Porcelain Tile Flooring - Kitchen & Bathroom
- Tile Flooring, Oakland
- Timber Industry Professionals, Oakland
- Timberland & Timberland Companies, Oakland
- Tire Repair, Recapping & Retread, Oakland
- Tires - Wholesale & Retail, Oakland
- Title Companies, Oakland - Title Search, Service & Abstract Company
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- Tools & Hardware Supplies, Oakland
- Tourist Attractions, Oakland
- Towing Service, Oakland
- Toy Stores, Oakland
- Tractor Repair & Service, Oakland
- Trading Posts, Oakland
- Trailer Parts & Equipment, Oakland
- Transportation, Oakland
- Transportation Equipment Manufacturers, Oakland
- Transportation Rental & Leasing, Oakland
- Travel & Tourism, Oakland
- Tree & Shrub Transplanting & Removal, Oakland
- Trenching & Excavating Equipment Rental, Oakland
- Tropical & Saltwater Fish Stores, Oakland
- Truck Rental & Leasing, Oakland - Rent a Truck & Tractor
- Truck Repair & Service, Oakland
- Trucking - Garbage, Refuse, Waste, Trash, Scrap & Junk Removal, Oakland - Collection, Removal, Disposal, Recycling, etc
- Trust Companies, Oakland
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