SDN Communications Share: Internet ServicesTechnical Consultants & SupportTelecommunications & Utilities SDN Communications Visit Website 2900 W 10th St Sioux Falls, SD 57104-2543 (800) 247-1442 (605) 334-4782 (fax) About Map About Telecommunication, Equipment, Systems & Services What's Nearby? Distance: 5 10 15 20 25 50 mi.