There are 27 cities in LaSalle County, Illinois.

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City
Rank
State
2024 Population
2020 Census
Annual Change
Density (mi²)
Area (mi²)
Ottawa1Illinois18,37218,848-0.8%1,43612.79
Streator2Illinois11,97512,466-1.19%1,6607.21
Peru3Illinois9,5559,919-1.12%9929.63
LaSalle4Illinois9,2179,565-1.1%71512.90
Mendota5Illinois6,7647,040-1.18%1,3395.05
Lake Holiday6Illinois5,4855,365 1,7133.20
Marseilles7Illinois4,6714,836-1.06%5159.07
Oglesby8Illinois3,5523,699-1.2%8754.06
Sheridan9Illinois2,3872,427-0.5%1,1971.99
Seneca10Illinois2,2562,342-1.14%3476.50
Somonauk11Illinois1,7441,787-0.8%7012.49
Earlville12Illinois1,5611,610-1.01%1,3001.20
North Utica13Illinois1,3271,3170.07%3843.46
Leland14Illinois906945-1.2%1,6970.53
Tonica15Illinois720748-1.1%5281.36
Millington16Illinois614617-0.16%8670.71
Dayton17Illinois498475 2222.25
Grand Ridge18Illinois493516-1.4%1,0670.46
Lostant19Illinois419433-1.18%3731.12
Naplate20Illinois400413-0.99%3,5400.11
Ransom21Illinois295311-1.67%2951
Cedar Point22Illinois253266-1.56%2481.02
Rutland23Illinois251256-0.79%3620.69
Kangley24Illinois219234-2.23%8390.26
Troy Grove25Illinois216225-1.37%3140.69
Dana26Illinois156160-0.64%7090.22
Leonore27Illinois119123-0.83%1,3370.09
showing: 27 rows

Cities in LaSalle County, Illinois by Population (2024)

What is the largest city in LaSalle County, Illinois?

Ottawa is the largest city in LaSalle County.

What is the smallest city in LaSalle County, Illinois?

Leonore is the smallest city in LaSalle County.

How many cities are in LaSalle County?

There are 27 cities in LaSalle County, Illinois.

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