1# Mattress Firm Sioux City Address: 5001 Sergeant Rd #255A, Sioux City, IA 51106 Reviews of the store Customers service was great! They made sure you understood everything. Greeted right away. Very friendly. Made sure we left with what we wanted. Very helpful through the process Absolutely loved the helpful staff in the store! … Continue reading Mattress Stores Near Sioux City