Northallerton is a market town and civil parish in North Yorkshire, England. The town is located near the River Wiske in the Vale of Mowbray. It had a population of 16,832 in the 2011 census, an increase from 15,741 in 2001. Northallerton is the county town of North Yorkshire and the administrative centre of North Yorkshire Council; until 1974 it was part of the North Riding of Yorkshire, of which it was also the county town.