Peru is a city in LaSalle and Bureau counties, Illinois, United States. The population was 9,896 at the 2020 census, down from 10,295 at the 2…Peru is a city in LaSalle and Bureau counties, Illinois, United States. The population was 9,896 at the 2020 census, down from 10,295 at the 2010 census. It is part of the Ottawa, IL Micropolitan Statistical Area. Peru and its twin city, LaSalle, make up the core of Illinois Valley.
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