Home Postcodes by state WA 6214 Postcode 6214 6214 is the postcode for 3 localities in WA: Birchmont, Coolup and West Coolup. Localities with postcode 6214BirchmontWACoolupWAWest CoolupWA Postcode 6214 State or territory Western Australia (WA) Localities 3 Council area Murray Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6213 · Postcode 6215