Home Postcode finder QLD Muldu Muldu postcode QLD Muldu is a locality in Queensland covered by postcode 4401. Postcode 4401 State or territory Queensland (QLD) Region Toowoomba Region Add a free Muldu business listing Be the first listing in Muldu Common questionsWhat is the postcode for Muldu?Muldu, QLD has the postcode 4401.What state is Muldu in?Muldu is in Queensland (QLD).Does postcode 4401 cover more than one suburb?Yes. Postcode 4401 covers 16 localities, so the postcode alone does not identify Muldu. Browse other postcodes in Queensland, or widen the search to every Australian postcode.