farnham postcode nswst Home ›› Postcode Finder ›› NSWST ›› Farnham Farnham local listingsThe suburb of Farnham is located in NSW and has a postcode of 2820. Free farnham business listing! Get the first free listing in farnham! Search and find other Postcodes in New South Wales or widen the search to Postcodes in Australia.