Home Postcodes by state WA 6256 Postcode 6256 6256 is the postcode for 6 localities in WA: Glenlynn, Kingston, Maranup, Sunnyside, Wandillup and Yornup. Localities with postcode 6256GlenlynnWAKingstonWAMaranupWASunnysideWAWandillupWAYornupWA Postcode 6256 State or territory Western Australia (WA) Localities 6 Council area Bridgetown-Greenbushes Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6255 · Postcode 6258