Home Postcodes by state SA 5440 Postcode 5440 5440 is the postcode for 7 localities in SA: Cockburn, Manna Hill, Mingary, Nackara, Olary, Waukaringa and 1 more. Localities with postcode 5440CockburnSAManna HillSAMingarySANackaraSAOlarySAWaukaringaSAYuntaSA Postcode 5440 State or territory South Australia (SA) Localities 7 Council area Unincorporated SA; Peterborough Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5434 · Postcode 5451