|La Salle County Illinois Cities/Towns - Cedar Point, Dana, Earlville, Grand Ridge, Kangley, La Salle, Leland, Leonore, Lostant, Marseilles, Mendota, Naplate, North Utica, Oglesby, Ottawa (County Seat), Peru, Ransom, Rutland, Sheridan, Streator, Tonica, Troy Grove
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LaSalle County is a county located in the U.S. state of Illinois. As of 2000, the population was 111,509. Its county seat is Ottawa.
LaSalle County was formed in 1831. It is named for the early French explorer, Robert de LaSalle.