geranium-plains postcode sa Home ›› Postcode Finder ›› SA ›› Geranium-Plains Geranium Plains local listingsThe suburb of Geranium Plains is located in SA and has a postcode of 5381. Free geranium plains business listing! Get the first free listing in geranium plains! Search and find other Postcodes in South Australia or widen the search to Postcodes in Australia.