LaSalle County borders Woodford, Marshall, Putnam, Bureau, Livingston, Lee, DeKalb, Kendall, and Grundy counties. Though LaSalle County is in the Chicago media market, it retains a unique identity with a mix of pleasant river towns, and vast expanses of farmland. The county is at the intersection of the Chicago, Peoria, Quad Cities and Rockford television markets, with all four regions advertising (and businesses from the respective regions) and having a strong influence on the area such that despite the county's short distance from Chicago, approximately . The county is part of the far southwestern reaches of the Chicago metropolitan area, and it is also part of the Fox Valley subregion and the larger Northern Illinois region.
LaSalle County was formed on January 15, 1831 out of Tazewell and Putnam Counties. It is named for the early French explorer René-Robert Cavelier, Sieur de La Salle. La Salle was the first European recorded as entering the area. He traveled the Mississippi River upriver from the Gulf of Mexico, claimed the land for France, or rather as a possession of King Louis XIV of France and named it Louisiana. In 1680, he and two other French traders built Fort Crevecoeur on the Illinois River in present-day Tazewell County, and in 1662, the Fort St. Louis on Starved Rock in present-day LaSalle County. By 1857, the county was served by the daily arrivals of two trains of the Illinois Central Railroad.
As William D. Boyce reportedly founded the Boy Scouts of America in Ottawa, the Council is named for him. He and two other founders established the BSA, but Boyce is given the sole credit since his faction of the BSA adopted the other two competing factions' elements within the organization. LaSalle County is within what is called the Lowaneu Region of the W.D. Boyce Council.
The Tri-County Area of DeKalb, LaSalle, and Kendall Counties have been influential in terms of their political, sports, multimedia, industry, and technology. DeKalb County was the birthplace of plant hybridization (DeKalb, DeKalb Agricultural), the hot-air hand dryer (Sandwich, Sahara-Pak), and is the home of supermodel Cindy Crawford, at least 6 MLB players, two NFL coaches, and three NFL players. LaSalle County was home to the Westclox Company for many years, was the site of the first Lincoln-Douglas Debates, and was the home to the discoverer of Pluto, as well as a Wild West figure, multiple published authors, a legendary NCAA athletic director and coach, and multiple political figures. Kendall County is the home to a seminal piece of 20th Century architecture, the birthplace of the Harvester Reaper, (as well as the precursor to the International Harvester Company), the plastic tackle box and plastic-injection molding, and is the home of multiple athletes, politicians, and a former Speaker of the House of Representatives. DeKalb, LaSalle, and Kendall Counties have all been featured in major films, either having been written by residents or former residents, having been filmed in the communities, or both.
Ottawa was the first site of the famous Lincoln–Douglas debates on August 21, 1858. The community has a strong association with the 16th President, and elements of the downtown area of the city retain much mid-19th century architecture. People in LaSalle County were predominantly abolitionist in attitude, and many Underground Railroad sites were maintained in the county prior to the American Civil War.
Utica (or the official name of North Utica) is considered the gateway to the Starved Rock area. Visiting three parks provides a full experience of the area. Starved Rock State Park, (south of Utica on Illinois Route 178), is the crown jewel. Matthiessen State Park (south of Starved Rock on Ill 178) has many of the same features of Starved Rock, but is smaller, and faces the Vermilion River to the west. Buffalo Rock State Park (east of Utica, and west of Naplate/Ottawa on Dee Bennett Road) has an enclosure which features American bison, as well as the mound sculpture complex, known as the Effigy Tumuli. The village is most well known for the April 20, 2004 tornado, which ripped through the downtown and killed nine people.