- Tanning Salons, Merrillville
- Tapas Bars, Merrillville
- Tattooing, Merrillville
- Tax Consultants, Merrillville
- Tax Planning, Merrillville
- Tax Preparations Electronic Filings, Merrillville
- Tax Return Preparation, Merrillville
- Tax Services, Merrillville
- Taxi Cab Service, Merrillville
- Taxi Service, Merrillville
- Technological Research & Development, Merrillville
- Telecommunications, Merrillville
- Telecommunications Companies, Businesses & Services, Merrillville
- Telecommunications Consultants, Merrillville
- Telephone Answering Service, Merrillville - Messenger Services
- Telephone Communication Service & Phone Companies, Merrillville - Local & Long Distance Telephone Service
- Telephone Equipment & Phone Systems, Merrillville - Sales, Service & Repair
- Telephone Equipment & Systems - Repair & Service, Merrillville - Telecommunication Services
- Temp Agencies, Merrillville
- Temporary & Contractor Agencies, Merrillville
- Tennis Clubs, Merrillville
- Tent Rentals, Merrillville
- Tents, Canopies & Awnings, Merrillville
- Teriyaki Restaurants, Merrillville
- Terrazzo Tile Marble & Mosaic Contractors, Merrillville
- Testing Laboratories, Merrillville - Lab Tests
- Theme & Entertainment Restaurants, Merrillville
- Thrift Stores, Resale & Consignment Shops, Merrillville
- Time & Temperature, Merrillville
- Tire Retread, Regroove & Repair Equipment, Merrillville
- Tires - Wholesale & Retail, Merrillville
- Title & Surety Insurance, Merrillville
- Title Companies, Merrillville - Title Search, Service & Abstract Company
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- Title Service, Merrillville
- Tools & Hardware Supplies, Merrillville
- Tourist Attractions, Merrillville
- Tower & Power Line Contractors, Merrillville
- Towers Buildings & Antennas, Merrillville
- Towing Service, Merrillville
- Toy Stores, Merrillville
- Toys Manufacturers Supplies, Merrillville
- Traffic Ticket Attorneys & Lawyers, Merrillville - Traffic Violation
- Traffic Ticket Lawyers & Attorneys, Merrillville - Traffic Violation
- Trailer Hitch, Merrillville - Accessories, Parts, Installation, etc
- Trailer Rental & Leasing, Merrillville
- Training & Seminars - Program Designing & Development, Merrillville
- Training Centers, Merrillville
- Training Consultants, Merrillville
- Training Programs Designing & Development, Merrillville - Training Consultants
- Translators & Interpreters, Merrillville
- Transplant Services, Merrillville
- Transportation, Merrillville
- Transportation & Traffic Consultants & Services, Merrillville - Transportation Brokers & Consultants
- Transportation Facilities & Services, Merrillville
- Transportation For Handicapped & Elderly, Merrillville - Senior & Disabled
- Transportation Rental & Leasing, Merrillville
- Travel & Tourism, Merrillville
- Travel Arrangement & Services, Merrillville
- Trinity Church, Merrillville
- Truck Rental & Leasing, Merrillville - Rent a Truck & Tractor
- Truck Repair & Service, Merrillville
- Trust And Will Attorneys & Lawyers, Merrillville
- Trust And Will Lawyers & Attorneys, Merrillville
- Tutoring Instructor, Merrillville
- TV Stations & Broadcasting Companies, Merrillville - Cable TV Networks, Talk Shows, etc
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