Home Postcode finder NSWDL St Marys South St Marys South postcode NSWDL St Marys South is a locality in New South Wales covered by postcode 2760. Postcode 2760 State or territory New South Wales (NSWDL) Region Nepean Add a free St Marys South business listing Be the first listing in St Marys South Common questionsWhat is the postcode for St Marys South?St Marys South, NSWDL has the postcode 2760.What state is St Marys South in?St Marys South is in New South Wales (NSWDL).Does postcode 2760 cover more than one suburb?Yes. Postcode 2760 covers 7 localities, so the postcode alone does not identify St Marys South. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.