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Waterloo is a city in Monroe County, Illinois, United States. The population was 9,811 at the 2010 census. It is the county seat of Monroe County.GeographyWaterloo is located at .According to the 2010 census, Waterloo has a total area of 7.66sqmi, of which 7.52sqmi is land and 0.14sqmi is water. Illinois Route 3 and Illinois Route 156 intersect within its bounds, and it is along the historic trail from Kaskaskia to St. Louis.Waterloo is in Illinois (IL). Take a peek at our online itinerary creator: Waterloo and its charms laid bare and easily scheduled.
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