Piatt County is located in central Illinois, United States. It was established in 1841 and is named after James Piatt, a local politician. The county seat is Monticello, which is known for its historical sites and vibrant community. The county covers an area of approximately 1,400 square miles and has a population of around 16,000 residents. Piatt County is primarily rural, with agriculture playing a significant role in its economy. The region features several parks and recreational areas, making it a pleasant place for outdoor activities.