Home Postcodes by state QLD 4342 Postcode 4342 4342 is the postcode for 6 localities in QLD: Crowley Vale, Forest Hill, Glen Cairn, Glenore Grove, Lockrose and Lynford. Localities with postcode 4342Crowley ValeQLDForest HillQLDGlen CairnQLDGlenore GroveQLDLockroseQLDLynfordQLD Postcode 4342 State or territory Queensland (QLD) Localities 6 Council area Lockyer Valley Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 4341 · Postcode 4343