Wallasey is a town in the Metropolitan Borough of Wirral, Merseyside, England. Within the boundaries of the historic county of Cheshire, it i…Wallasey is a town in the Metropolitan Borough of Wirral, Merseyside, England. Within the boundaries of the historic county of Cheshire, it is at the mouth of the River Mersey, on the north-eastern corner of the Wirral Peninsula. At the 2011 Census, the population was 60,284.