Home Postcode finder QLD Back Plains Back Plains postcode QLD Back Plains is a locality in Queensland covered by postcode 4361. Postcode 4361 State or territory Queensland (QLD) Region Toowoomba Region Add a free Back Plains business listing More business listings in Back Plains Businesses in Back PlainsBack Plains State School874 Clifton-Pittsworth Highway · 07 46958571 Common questionsWhat is the postcode for Back Plains?Back Plains, QLD has the postcode 4361.What state is Back Plains in?Back Plains is in Queensland (QLD).Does postcode 4361 cover more than one suburb?Yes. Postcode 4361 covers 16 localities, so the postcode alone does not identify Back Plains. Browse other postcodes in Queensland, or widen the search to every Australian postcode.