South Dakota has peaked the charts with a 13 percent increase in milk production from the previous year, according to the USDA, which is the single largest jump in any state. former-Gov. Bill Janklow's pushed the dairy industry during his term in office. Even as statewide dairy farm numbers took a dip, Janklow saw an opportunity to boost the South Dakota economy. He began actively recruiting milk processing plants to the state to encourage growth in the dairy industry.