The Waterloo East Commercial Historic District is a nationally recognized historic district located in Waterloo, Iowa, United States. It was listed on the National Register of Historic Places in 2011. At the time of its nomination the district consisted of 36 resources, including 28 contributing buildings, and eight non-contributing buildings. The city of Waterloo was established in the early 1850s. Its first settlers started developing the west side of the city before crossing the Cedar River and developing east side. The first Black Hawk County Courthouse was built on the east side in 1856 and East Waterloo Township was created two years later. As industry began to develop along the river, and the arrival of the first railroad in 1861, the commercial district on the east side began to gr