Home Postcodes by state SA 5154 Postcode 5154 5154 is the postcode for Aldgate, SA. Localities with postcode 5154AldgateSA Postcode 5154 State or territory South Australia (SA) Localities 1 Council area Adelaide Hills Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5153 · Postcode 5155