Home Postcodes by state WA 6313 Postcode 6313 6313 is the postcode for Highbury, WA. Localities with postcode 6313HighburyWA Postcode 6313 State or territory Western Australia (WA) Localities 1 Council area Narrogin Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6312 · Postcode 6315