Home Postcodes by state SA 5577 Postcode 5577 5577 is the postcode for 3 localities in SA: Foul Bay, Inneston and Warooka. Localities with postcode 5577Foul BaySAInnestonSAWarookaSA Postcode 5577 State or territory South Australia (SA) Localities 3 Council area Yorke Peninsula Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5576 · Postcode 5580