LaSalle County has an area of 1135 square miles. In Illinois, only McLean County is larger with 1184 square miles. LaSalle County’s population is the 17th largest among the 102 counties in Illinois. There are 363.46 miles of county highway In LaSalle County that ranks Lasalle 2nd of 102. There are 81 major structures on the LaSalle County highway system, the 6th largest in Illinois. LaSalle Counties 37 townships are the most in the state.

 

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