Sioux City Location
Certified Testing Services, Inc.
CTS’s Sioux City location has moved!
The new Sioux City office is located at 1400 US Highway 75 Sioux City , IA 51105.
Our mailing address will remain at P.O. Box 1193, Sioux City, IA 51102.
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Physical Address:
Mailing Address:
PO Box 1193
Sioux City, IA 51102
- Mon - Fri
- -
- Sat - Sun
- Closed
Saturday and Sunday Hours By Appointment Only
Holiday Hours
- Monday, May 26, 2025 : Closed
- Thursday, June 19, 2025 : Closed
- Friday, July 4, 2025 : Closed
- Monday, September 1, 2025 : Closed
- Monday, October 13, 2025 : Closed
- Tuesday, November 11, 2025 : Closed
- Thursday, November 27, 2025 : Closed
- Thursday, December 25, 2025 : Closed
Main Phone: (712) 252-5132
Fax: (712) 252-0110
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