Located in Warrenton, MO, Preferred Outlets at Warrenton serves shoppers from across the region. Shoppers can find this Value-Retail Center at I-70 Exit 143. Preferred Outlets at Warrenton first opened in 1993. The mall spans 200,000 sqft. of leasable retail area and is home to around 27 stores. Guests will find 1,300 parking spaces at the venue.