The data for Jefferson County are summarized in this water planning data fact sheet. Jefferson County is located in southeast Iowa.
Service is the principal economic sector, as measured by employee earnings.
The county contains steeply rolling hills and small drainage streams. The population of 16,310 is distributed in 6 incorporated cities and the surrounding rural areas. U.S. Highway 34 crosses the county from east to west. State Highway 1 crosses the county from north to south. This data sheet focuses on water uses that withdraw water from ground and surface water sources.