Peru, Illinois

Peru
4th Street Looking East in Downtown Peru
Location of Peru in LaSalle County, Illinois.
Coordinates: 41°21′20″N 89°07′33″W / 41.35556°N 89.12583°W / 41.35556; -89.12583
CountryUnited States
StateIllinois
CountyBureau, LaSalle
TownshipsPeru, Dimmick, Hall
Founded1835
Government
 • MayorKen Kolowski
Area
 • Total
10.12 sq mi (26.21 km2)
 • Land9.98 sq mi (25.86 km2)
 • Water0.14 sq mi (0.35 km2)
Elevation
640 ft (200 m)
Population
 (2020)
 • Total
9,896
 • Estimate 
(2024)
9,793
 • Density977.9/sq mi (377.57/km2)
Time zoneUTC−6 (CST)
 • Summer (DST)UTC−5 (CDT)
ZIP Code(s)
61354
Area code815
FIPS code17-59234
GNIS feature ID2396189
WebsiteCity of Peru official website

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.