Suggest an update Name* Categories* State* Locality* ZIP* Street address* Phone* Website* Company description* Attorney Thomas J. Welk, practice areas Business Litigation Attorneys. Is located in the city of Sioux Falls, the state of South Dakota. Legal address 300 S. Main AvenuePO Box 5015, Sioux Falls, SD 57104. For more information, please call Not available Your comments* (not for publishing) * — Required information Thomas J. Welk ← View details 300 S. Main AvenuePO Box 5015, Sioux Falls, SD 57104, Sioux Falls, South Dakota Not available