LaSalle County is located in the state of Illinois, known for its rich history and diverse landscapes. The county was established in 1831 and is named after the French explorer René-Robert Cavelier, Sieur de La Salle. It features a mix of urban and rural areas, with the city of Ottawa serving as the county seat. The county is home to several parks and recreational areas, including parts of the Illinois River and Starved Rock State Park. LaSalle County also has a strong agricultural presence, contributing to the local economy through farming and related industries.