Barnston is a village and former civil parish in the Wirral district, in the county of Merseyside, England, situated on the Wirral Peninsula to the north east of Heswall. The village is in the Pensby& Thingwall Ward and the parliamentary constituency of Wirral West. At the 2001 Census, Barnston had a population of 3,620 At the 2011 Census, the population was 947.