Vinegar Hill Township is one of twenty-three townships in Jo Daviess County, Illinois, USA. As of the 2000 census, its population was 250. Its name changed from Mann Township on September 18, 1857. Jo Daviess County is a county located in the northwest corner of U.S. state of Illinois. As of 2000, the population was 22,289. Its county seat is Galena, Illinois. As part of the Driftless Area, Jo Daviess County is known for its extraordinarily scenic stretches of road and valley views. Within Jo Daviess County lies Charles Mound, the highest natural point in Illinois.