Danville is a city in Vermilion County, Illinois, United States. It is the principal city of the 'Danville, Illinois Metropolitan Statistical Area' which encompasses all of Danville and Vermilion County. As of the 2010 census, the city had a total population of 32,467. It is the county seat of Vermilion County. Danville is the 14th-most populous city in Illinois, outside of the Chicago Metropolitan Area.