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Waterloo
City in Illinois
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Waterloo is a city in and county seat of Monroe County, Illinois, United States. The population was 11,013 at the 2020 census, up from 9,811 in 2010.
Wikipedia
Population
:
11,130 (2022)
ZIP code
:
62298
Area code
:
618
Chartered as town
:
1849
Elevation
:
717 ft (219 m)
Founded
:
1818