Home Postcodes by state SA 5240 Postcode 5240 5240 is the postcode for Lenswood, SA. Localities with postcode 5240LenswoodSA Postcode 5240 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 5238 · Postcode 5241