Matching historic trends, South Dakota's median household income in 2015 (about $53,000) remained below the nationwide median (about $56,000). But the gap was much smaller than before the Great Recession. In 1999, South Dakota's median income of about $50,000 compared to about $60,000 nationally.
Lincoln County ranks No. 1 among South Dakota's 66 counties, with a median household income of $77,540 in 2015, while Buffalo County ranks 66th, at $22,894.
Around 114,000 South Dakotans lived in poverty in 2015, accounting for 13.7 percent of the state's population. That's an increase from about 107,000 in poverty in 2012.
More than 37,000 of those in poverty in 2015 were children under age 18, while 10,634 were senior citizens. The remaining 66,190 were adults between the ages of 18 and 64.