Home Postcode finder QLD Didcot Didcot postcode QLD Didcot is a locality in Queensland covered by postcode 4621. Postcode 4621 State or territory Queensland (QLD) Region Sunshine Coast Add a free Didcot business listing Be the first listing in Didcot Common questionsWhat is the postcode for Didcot?Didcot, QLD has the postcode 4621.What state is Didcot in?Didcot is in Queensland (QLD).Does postcode 4621 cover more than one suburb?Yes. Postcode 4621 covers 11 localities, so the postcode alone does not identify Didcot. Browse other postcodes in Queensland, or widen the search to every Australian postcode.