Big D

Big D operates 39 retail locations in Western South Dakota, Eastern Wyoming, and Northern Colorado.

Back in 1934 at Sundance, Wyoming, Andy Policky built the 75-barrel-a day Crook County Refinery and started selling petroleum products at his service stations in Sundance and across the state line in Belle Fourche,SD. The Policky’s incorporated as Big D Oil Company in 1963, at which time Don Policky took over at the business. The following decades brought many changes and upgrades including Conven  ...