Morpeth is a historic market town in Northumberland, England, lying on the River Wansbeck. Nearby towns include Ashington and Bedlington. I…Morpeth is a historic market town in Northumberland, England, lying on the River Wansbeck. Nearby towns include Ashington and Bedlington. In the 2011 census, the population of Morpeth was given as 14,017, up from 13,833 in the 2001 census. The earliest evidence of settlement is believed to be from the Neolithic period, and some Roman artifacts have also been found.