La Salle County (LaSalle County) , Illinois

La Salle County: County in Illinois, United States

LaSalle County locator map
Location of LaSalle County on Illinois map.


LaSalle County is a county located in the U.S. state of Illinois. As of the 2010 census, the population was 113,924 and a population density of 38 people per km². After 10 years in 2020 county had an estimated population of 107,571 inhabitants. Its county seat is Ottawa. The county was created 190 years ago in 1831.

LaSalle County Courthouse '8745757340' image
LaSalle County Courthouse '8745757340'
LaSalle County Courthouse '8745757340' image


LaSalle County is located at 41°20'38"N 88°53'9"W (41.3439900, -88.8859500). It has 8 neighbors: Bureau County, DeKalb County, Grundy County, Lee County, Livingston County, Marshall County, Putnam County and Woodford County.

La Salle County map

The largest city of LaSalle County is Ottawa with a population of 18,097. Other cities include, Streator population 12,933, Peru population 9,612, La Salle population 9,609 and Marseilles population 4,778. See all LaSalle County cities & populated places.


LaSalle County forecast: Sunny, with a high near 72. South southwest wind 5 to 10 mph, with gusts as high as 25 mph. more

LaSalle County Quick Facts

Population : 107,571 (2020)
Country : United States of America
State : Illinois (United States)
Different from : La Salle County, La Salle Parish
Area : 2973 km2
Water as percent of area : 1.1%
Land as percent of area : 98.9%
Named for : René-Robert Cavelier, Sieur de La Salle
Altitude : 646 feet / 197 meters
Capital : Ottawa
Establishment : January 01, 1831
Time Zone : America/Chicago
Local time : 00:33:44 (19th October 2021)
Density : 36 Pop. per km² as of 2020
Population growth : -5.91% (2010-2020)
Weather : 72℉ Sunny 7-days weather

LaSalle County has 8 neighbours.


According to census records, the population of LaSalle County decreased by 5.91% in 10 years.

Year Population % Change Method
2010 113,924 - census
2011 113,533 -0.34% estimation process
2012 112,918 -0.54% estimation process
2013 112,430 -0.43% estimation process
2014 111,660 -0.69% estimation process
2015 111,019 -0.58% estimation process
2016 110,215 -0.73% estimation process
2017 109,622 -0.54% estimation process
2018 109,159 -0.42% estimation process
2019 108,669 -0.45% estimation process
2020 107,571 -1.02% estimation process

Comitatul LaSalle, Comte de La Salle, Comte de LaSalle, Comté de La Salle, Comté de LaSalle, Condado de La Salle, Condado de LaSalle, Condado han LaSalle, Contea di LaSalle, Hrabstwo LaSalle, La Salle County, La-Sall, LaSal, LaSalle, LaSalle Comitatus, LaSalle County, LaSalle Kun, LaSalle Kūn, LaSalle konderria, LaSalle megye, LaSell srjan, Lasalle County, Okrug Lasal, Quan LaSalle, Quận LaSalle, la sa er xian, la salle ka'unti, mqatʿt lasal, rasaru jun, Ла-Салл, ЛаСал, Округ Ласал, ԼաՍելլ շրջան, لاسالے کاؤنٹی, لاسیل کاؤنٹی، الینوائے, مقاطعة لاسال, লা সাল্লে কাউন্টি, ラサール郡, 拉薩爾縣

People born in LaSalle County (8)

People born in LaSalle County, including paleontologist Stephen L. Brusatte, politician Dwight M. Sabin, violinist Maud Powell, you can see a list of people who born in LaSalle County.

  • Kate Austin (American journalist/advocate of feminist/anarchist causes) she was born in 25/07/1864
  • William Scherzer (American engineer) he was born in 27/01/1858
  • Deacon Van Buren (American baseball player) he was born in 14/12/1870
  • Si Johnson (American baseball player) he was born in 05/10/1906
  • Harry Haviland Osgood (Born September 1875, in Illinois; died 1960. American, Painter.) he was born in 01/09/1875

Other places with the same name (2)

LaSalle County Populated Places (more)

Cities, Towns, Neighborhoods & Other Populated Places in LaSalle County.

City Name Population Title
Ottawa 18,097 City in Illinois, United States
Streator 12,933 City in Illinois
Peru 9,612 City in Illinois, United States
La Salle 9,609 City in LaSalle County, Illinois, United States
Mendota 6,904 Township in LaSalle County, Illinois
Northville 6,753 Township in LaSalle County, Illinois
Marseilles 4,778 City in LaSalle County, Illinois
Deer Park 4,199 Village in United States of America
Oglesby 3,526 City in LaSalle Co.
Sheridan 2,515 Village in Illinois, United States
Seneca 2,179 Village in Illinois
Utica 1,988 Village also known as Utica, in LaSalle County, Illinois
Earlville 1,570 City in Delaware County, Iowa, United States of America
Garfield 1,483 Human settlement in Illinois, United States of America
Serena 1,088 Human settlement in Illinois, United States of America
Leland 902 Village in Illinois, United States

Illinois Other Counties (more counties)

County Name Population Title
Cook County 5,108,284 County in Illinois, United States
Chicago 2,677,643 City and county seat of Cook County, Illinois, United States
DuPage County 917,481 County in Illinois, United States
Lake County 693,593 County in Oregon, United States
Will County 688,726 County in Illinois, United States
Kane County 531,010 County in southern Utah, United States
Markham 328,966 City in Cook County, Illinois, United States
McHenry County 305,888 County in Illinois, United States
Winnebago County 281,295 County in Illinois, United States
Madison County 262,635 County in Montana, United States
Saint Clair County 258,046 The County of St.
Champaign County 209,192 County in Illinois, United States
Aurora 196,383 City in Kane County, Illinois, United States
Sangamon County 193,882 County in Illinois, United States
Peoria County 177,652 County in Illinois, United States of America
McLean County 171,256 County in North Dakota, United States