The data for Black Hawk County are summarized in this water planning data fact sheet. Black Hawk County is located in east central Iowa.
Manufacturing is the principal economic sector, as measured by employee earnings.
The county contains gently rolling hills with long slopes, the Cedar River Valley, and small drainage streams. The population of 123,798 is distributed in 10 incorporated cities and the surrounding rural areas. Interstate Highway 380 enters the county from the southeast and ends in Waterloo. Highway 20 crosses the center of the county from east to west. U.S. Highway 63 traverses the county from north to south.