Big O Concrete, located in Mitchell, SD, is flatwork at its finest. We provide residential and commercial services, including removal, replacement, and new construction. Providing concrete services for Residential- Commercial and Agricultural areas. Services Offered - All Flatwork Poured Walls Driveways Sidewalks Steps Curb and Gutter Grain Bin Floors Site Development and more. Serving the Southeastern South Dakota Area. We are Licensed & Insured, offer free estimates and all work is guaranteed. Call us today!