Although a few natural hazard mitigation policies and techniques exist to provide resilience to built environmental Australian communities, few empirical studies have been conducted to develop tools that measure the vulnerability of states and territories to flood disasters. This paper proposes an approach to analyse and rank the vulnerabilities of Australian states and territories, in terms of their coastal buildings and transport infrastructures, to flood disasters by considering socio-economic and built environment attributes independently and simultaneously, using a multi-attribute decision-making tool. The results show remarkable changes occurring in ranking states and territories when both socio-economic and the built environment attributes were considered simultaneously. Queensland is the most vulnerable state in Australia based on socio-economic exposure analysis, but it ranks second, followed by Western Australia, based on the built environment exposure analysis. These results would assist government and other institutes to prepare high-level natural hazard mitigation planning.