Waterloo is a city in and the county seat of Black Hawk County, Iowa, United States. As of the 2020 United States Census the population was 67,314, making it the eighth-largest city in the state.Waterloo comprises a twin conurbation with neighbor municipality Cedar Falls. Waterloo is part of the Waterloo-Cedar Falls Metropolitan Statistical Area, and is the more populous of the two cities.
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Coordinates 42°29'53.79" N -92°19'58.347" E