Winnebago County is a county located in the U.S. state of Illinois. According to the 2020 census, it had a population of 285,350. Its county seat is Rockford. Winnebago County is the central county of the Rockford metropolitan area. Winnebago County offers more than ten thousand acres of forest preserves and parks.

Peoria County is located in the U.S. state of Illinois. The 2020 United States census listed its population at 181,830. Its county seat is Peoria. Peoria County is part of the Peoria metropolitan area.

DuPage County is a county in the U.S. state of Illinois, and one of the collar counties of the Chicago metropolitan area. As of the 2020 census, the population was 932,877, making it Illinois' second-most populous county. Its county seat is Wheaton.

Peoria is a city in Peoria County, Illinois, and its county seat. Located on the Illinois River, the city had a population of 113,150 as of the 2020 census. There is no shortage of fun in the Peoria Area. With endless options for first-time visitors, it may be difficult to decide what to do!

Niles is a village in Cook County, Illinois, located in the townships of Maine and Niles, directly neighboring Chicago's far northwest border. Per the 2020 census, the population was 30,912. A notable landmark and point of pride among Niles' residents is the Leaning Tower of Niles, a smaller-scale replica of the Leaning Tower of Pisa.

Aurora is a city in DuPage, Kane, Kendall, and Will counties in the U.S. state of Illinois. Aurora's 2019 population was at 197,757.

Waukegan is a city in Lake County, Illinois, United States, and its county seat. As of the 2020 census, its population was 89,321, making it the most populous city in Lake County. Located on the shores of Lake Michigan, Waukegan offers year-round special events and an emphasis on the arts. Stroll through downtown Waukegan featuring numerous art galleries, colorful murals and unique restaurants.

Schaumburg is a village in Cook and DuPage counties in the U.S. state of Illinois. Per the 2020 census, the population was 78,723, making Schaumburg the most populous incorporated village in the United States. Schaumburg is a thriving village known for innovation, community, and rich history in the heart of the northwest suburbs of Chicago.

Cook County is the most populous county in the U.S. state of Illinois and the second-most-populous county in the United States, after Los Angeles County, California. More than 40 percent of all residents of Illinois live within Cook County. As of 2020, the population was 5,275,541. The county seat is Chicago, the most populous city in Illinois and the third most populous city in the United States.

Springfield is the capital city of the state of Illinois in the United States. It serves as the capital of Illinois and is the political hub of the state. The Illinois State Capitol Building, located in downtown Springfield, is where the legislative and executive branches of the state government operate. Springfield’s 2019 population was 114,230. Springfield is the county seat of Sangamon County.