grantham postcode qldga Home ›› Postcode Finder ›› QLDGA ›› Grantham Grantham local listingsThe suburb of Grantham is located in QLD and has a postcode of 4347. Free grantham business listing! 1Grantham State School15 Victor St 07 546612592Ma Ma Creek State School803 Gatton Clifton Highway 07 54627271 View more business listings in grantham Search and find other Postcodes in Queensland or widen the search to Postcodes in Australia.