Home Postcodes by state WA Grass Valley Grass Valley postcode WA Grass Valley is a locality in Western Australia covered by postcode 6403. Postcode 6403 State or territory Western Australia (WA) Region Wa Subs 1 G Flds Council area Northam Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Add a free Grass Valley business listing Be the first listing in Grass Valley Suburbs near Grass ValleyStraight-line distance between locality centres.MalabaineWA 6401 · 7.3 kmThrossellWA 6401 · 7.9 kmMuluckineWA 6401 · 8.4 kmMeenaarWA 6401 · 9.0 kmSouthern BrookWA 6401 · 9.5 kmNorthamWA 6401 · 12.0 kmJennapullinWA 6401 · 13.2 kmIrishtownWA 6401 · 14.3 kmQuellingtonWA 6302 · 15.0 kmCaljieWA 6302 · 16.6 kmSpencers BrookWA 6401 · 17.6 kmMureskWA 6401 · 17.7 km Common questionsWhat is the postcode for Grass Valley?Grass Valley, WA has the postcode 6403.What state is Grass Valley in?Grass Valley is in Western Australia (WA).What council is Grass Valley in?Grass Valley is in the Northam local government area.Does postcode 6403 cover more than one suburb?No. Postcode 6403 covers Grass Valley only, which is unusual - most Australian postcodes cover several localities.What suburbs are near Grass Valley?The closest are Malabaine (7.3 km), Throssell (7.9 km), Muluckine (8.4 km), Meenaar (9.0 km) and Southern Brook (9.5 km). Distances are straight lines between locality centres. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.