Home Postcodes by state QLD 4423 Postcode 4423 4423 is the postcode for 2 localities in QLD: Glenmorgan and Teelba. Localities with postcode 4423GlenmorganQLDTeelbaQLD Postcode 4423 State or territory Queensland (QLD) Localities 2 Council area Mainly Western Downs, partly Maranoa; Maranoa Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 4422 · Postcode 4424