- Joliet is a city in Will County, Illinois, United States. It is located approximately 40 miles southwest of Chicago and has a population of about 148,000 people. Joliet is known for its industrial history, with a strong manufacturing and steel production presence. It is home to the Chicagoland Speedway and the historic Rialto Square Theatre, which is considered one of the most beautiful theaters in the United States. Joliet offers a range of amenities and attractions, including parks, museums, shopping centers, and a vibrant downtown area. The city is also known for its corrections facilities, including the Joliet Correctional Center, which has been featured in several movies and TV shows.