Welcome to Danville Borough Danville is a borough in and the county seat of Montour County, Pennsylvania, United States, along the North Branch of the Susquehanna River. Danville is home to 4,699 people as of the 2010 census. 2016 Water Quality Drinking Report is now available for pick up in our office, posted on the website, and hard copies will be sent out next week. The Borough is on Facebook! Please do not send friend requests to the Borough. Simply Like and Follow our page by clicking here.