Home Postcode finder QLD Waterloo Waterloo postcode QLD Waterloo is a locality in Queensland covered by postcode 4673. Postcode 4673 State or territory Queensland (QLD) Region Sunshine Coast Add a free Waterloo business listing Be the first listing in Waterloo Common questionsWhat is the postcode for Waterloo?Waterloo, QLD has the postcode 4673.What state is Waterloo in?Waterloo is in Queensland (QLD).Does postcode 4673 cover more than one suburb?Yes. Postcode 4673 covers 3 localities, so the postcode alone does not identify Waterloo. Browse other postcodes in Queensland, or widen the search to every Australian postcode.