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Contact MDT Please use our contact list for specific services to help you find the correct individual or area you are looking for. Mailing Address: Montana Department of Transportation 2701 Prospect Avenue PO Box 201001 Helena MT 59620-1001 Phone: 406.444.6201 | TTY: 800.335.7592 (Staffed 8am-5pm, Monday-Friday, except state holidays. ) For detailed organization charts, please contact . 
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