What was the population in the 2011 census of the town that is connected to the towns of Birdwood, Woodside, Balhannah, Hahndorf, and Meadows by Onkaparinga Valley Road?
Onkaparinga Valley Road: Onkaparinga Valley Road is a South Australian secondary road, connecting the towns of Birdwood, Woodside, Balhannah, Hahndorf and Meadows in the Adelaide Hills with Willunga in the southern Adelaide metropolitan area. Willunga, South Australia:  At the 2011 census , Willunga had a population of 2,416.
2,416