Thornhill is a community in the Mid Nithsdale location of Dumfries and also Galloway, Scotland, south of Sanquhar and also north of Dumfries on the main A76 road. Thornhill beings in the Nithsdale valley with the Carsphairn and also Scaur range to the west and the Lowther hillsides to the eastern. It was at first a tiny village, intended and integrated in 1717 on the Queensberry Estate when driving connecting Dumfries to Glasgow. The Earl of Queensberry originally called the town 'New Dalgarnock' however the name did not accomplish prominent approval. The town is largely consisted of a grid pattern with the major street of Drumlanrig Street (the A76), East and also West Morton Streets, New Street, Townhead Street and Gill Road (the A702). The town is near Drumlanrig Castle, a 17th-century turreted manor once the old Douglas stronghold, now residence to the Duke of Buccleuch as well as Queensberry. The grounds contain Tibbers Castle which was founded in the 12th or 13th century. One of the most just recently published Census data from 2001 puts the population at 1,512 citizens.