Home Postcodes by state SA 5501 Postcode 5501 5501 is the postcode for 14 localities in SA: Avon, Calomba, Dublin, Lewiston, Long Plains, Lower Light and 8 more. Localities with postcode 5501AvonSACalombaSADublinSALewistonSALong PlainsSALower LightSAMiddle BeachSAParhamSAPort GawlerSAThompson BeachSATwo WellsSAWebb BeachSAWild Horse PlainsSAWindsorSA Postcode 5501 State or territory South Australia (SA) Localities 14 Council area Wakefield; Adelaide Plains; Mainly Adelaide Plains, partly Wakefield Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5495 · Postcode 5502