Ottawa, Illinois

Ottawa, Illinois
Downtown Ottawa in May 2008
Nicknames: 
Radium City, The Friendly City, The Town of Two Rivers, The City On Sand, The Town of Stovepipe hats
Interactive map of Ottawa, Illinois
Ottawa
Ottawa
Coordinates: 41°21′20″N 88°49′35″W / 41.35556°N 88.82639°W / 41.35556; -88.82639
CountryUnited States
StateIllinois
CountyLaSalle
TownshipsOttawa, South Ottawa, Dayton, Rutland, Wallace
Incorporated1853
Government
 • TypeMayor–council
Area
 • Total
15.52 sq mi (40.19 km2)
 • Land14.66 sq mi (37.96 km2)
 • Water0.86 sq mi (2.22 km2)
Elevation
476 ft (145 m)
Population
 (2020)
 • Total
18,840
 • Density1,282.0/sq mi (494.98/km2)
Time zoneUTC−6 (CST)
 • Summer (DST)UTC−5 (CDT)
ZIP code
61350
Area codes815, 779
FIPS code17-56926
GNIS feature ID2396106
Websitecityofottawa.org

Ottawa is a city in LaSalle County, Illinois, United States, and its county seat. It is located at the confluence of the navigable Fox River and Illinois River, the latter being a conduit for river barges and connects Lake Michigan at Chicago to the Mississippi River. The population was 18,840 at the 2020 census. It is the principal city of the Ottawa, Illinois, micropolitan area.