The data for Union County are summarized in this water planning data fact sheet.
Union County is located in southwest Iowa.
Government is the principal economic sector, as measured by employee earnings. The county contains gently rolling hills, the Thompson River Valley, and small drainage streams. The population of 12,750 is distributed in 8 incorporated cities and the surrounding rural areas. U.S. Highway 34 crosses the center of the county from east to west. U.S. Highway 169 crosses the center of the county from north to south.