Suggest an update Name* Categories* State* Locality* ZIP* Street address* Phone* Website* Company description* Attorney Dennis L. Duncan, practice areas Lobbying Attorneys. Is located in the city of Sioux Falls, the state of South Dakota. Legal address 5000 South Broadband LaneSuite 119, Sioux Falls, SD 57108. For more information, please call 605-361-9840 Your comments* (not for publishing) * — Required information Dennis L. Duncan ← View details 5000 South Broadband LaneSuite 119, Sioux Falls, SD 57108, Sioux Falls, South Dakota 605-361-9840