Rockford is a city located in Winnebago County, Illinois, United States. It is the third-largest city in Illinois and the county seat of Winnebago County. Rockford is known for its manufacturing and industrial heritage, with a strong presence in the automotive and aerospace industries. The city is also known for its vibrant arts scene, including the Rockford Symphony Orchestra and the Anderson Japanese Gardens. Additionally, Rockford offers a variety of outdoor activities, such as hiking, biking, and boating along the Rock River.