- Telecommunications, Mayville
- Telephone Communication Service & Phone Companies, Mayville - Local & Long Distance Telephone Service
- Television Stores & Dealers, Mayville
- Television Systems - Closed Circuit Telecasting, Mayville - CCTV
- Thrift Stores, Resale & Consignment Shops, Mayville
- Title & Surety Insurance, Mayville
- Title Companies, Mayville - Title Search, Service & Abstract Company
- Tools & Hardware Supplies, Mayville
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