City of South Sioux City Share: Government City of South Sioux City Visit Website 1615 1st Ave South Sioux City, NE 68776-2236 (402) 494-7517 (402) 494-7527 (fax) Facebook Hours: Visit www.southsiouxcity.org About Map About Governmental Agencies, Entities & Individuals Directions Visit www.southsiouxcity.org What's Nearby? Distance: 5 10 15 20 25 50 mi.