Home Postcode finder QLD Frankfield Frankfield postcode QLD Frankfield is a locality in Queensland covered by postcode 4721. Postcode 4721 State or territory Queensland (QLD) Region Central QLD Add a free Frankfield business listing Be the first listing in Frankfield Common questionsWhat is the postcode for Frankfield?Frankfield, QLD has the postcode 4721.What state is Frankfield in?Frankfield is in Queensland (QLD).Does postcode 4721 cover more than one suburb?Yes. Postcode 4721 covers 8 localities, so the postcode alone does not identify Frankfield. Browse other postcodes in Queensland, or widen the search to every Australian postcode.