Danville is a borough in Montour County, Pennsylvania, USA, of which it is the county seat, on the North Branch of the Susquehanna River. Danville was the home to 8,042 people in 1900, 7,517 people in 1910, and 7,122 people in 1940. The population was 4,897 at the 2000 census.. Danville apartments for rent comparison page shows most up to date rent information on Danville apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.