Waterloo, Illinois

Waterloo, Illinois
Monroe County Courthouse in the Waterloo Historic District
Etymology: Battle of Waterloo
Motto(s): 
"City Conveniences, Rural Advantages"
Location in Monroe County, Illinois
Waterloo
Location in the United States
Coordinates: 38°20′7″N 90°9′10″W / 38.33528°N 90.15278°W / 38.33528; -90.15278
CountryUnited States
StateIllinois
CountyMonroe
Precincts16, 17, 18, 19, 26, and 27
Founded1818
Chartered as town1849
Incorporation1889
Government
  MayorStan Darter
Area
  Total
8.31 sq mi (21.53 km2)
  Land8.18 sq mi (21.19 km2)
  Water0.13 sq mi (0.35 km2)
Elevation
717 ft (219 m)
Population
 (2020)
  Total
11,013
  Density1,351.95/sq mi (522.02/km2)
Time zoneUTC-6 (CST)
  Summer (DST)UTC-5 (CDT)
ZIP code
62298
Area code618
FIPS code17-79150
Wikimedia CommonsWaterloo, Illinois
Websitewww.waterloo.il.us

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.