In 2015, 408,150 South Dakotans aged 16-64 were working, accounting for 76.4 percent of the working-age population (534,425). This figure includes the self-employed and farm workers, even if unpaid.
South Dakota ranks No. 2 nationally for its proportion of working-age residents doing work. North Dakota ranks No. 1, at 78.5 percent, while West Virginia ranks 50th, at 59.5 percent.
In 2015, 27.5 percent of South Dakotans over age 25 held bachelor's degrees or higher, lagging the national average of 30.6 percent. South Dakota ranks 34th among the 50 states on this metric.
Clay County ranked first among South Dakota's 66 counties for those over 25 holding bachelor's degrees or higher, with an average of 45.0 percent between 2011 and 2015. Buffalo County ranked 66th, at 9.5 percent.