Home Postcode finder QLD St Helens St Helens postcode QLD St Helens is a locality in Queensland covered by postcode 4650. Postcode 4650 State or territory Queensland (QLD) Region Sunshine Coast Add a free St Helens business listing More business listings in St Helens Businesses in St HelensAgnew SchoolFazio Rd · 07 41233150St Helens State School891 Saltwater Creek Rd · 07 41202222 Common questionsWhat is the postcode for St Helens?St Helens, QLD has the postcode 4650.What state is St Helens in?St Helens is in Queensland (QLD).Does postcode 4650 cover more than one suburb?Yes. Postcode 4650 covers 48 localities, so the postcode alone does not identify St Helens. Browse other postcodes in Queensland, or widen the search to every Australian postcode.