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Waterloo, city, seat (1855) of Black Hawk county, northeastern Iowa, U.S., along both sides of the Cedar River, adjacent to Cedar Falls on the west. The site was first settled in 1845 as Prairie Rapids, and the name Waterloo was adopted in 1851. The town grew as a railroad division point and a regional trade centre. Waterloo’s industries include meatpacking and the manufacture of tractors and farm equipment, and each September the city hosts the...