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Waterloo is a city in and the county seat of Black Hawk County, Iowa, United States. As of the 2010 United States Census the population decreased by 0.5% to 68,406; a recent 2011 Census estimates the population at 68,653, making it the sixth-largest city in the state. Waterloo is part of the Waterloo – Cedar Falls Metropolitan Statistical Area, and is the more populous of the two cities.
- Waterloo, Iowa on Wikipedia