Historically, the Eastern Quoll occurred on Tasmania and on the Australian mainland, including South Australia (from the southern Flinders Range to the Fleureu Peninsula), Victoria, and New South Wales to the mid-north coast (C. Rehberg pers. comm.). The range has now been reduced by 50-90%. It has become extinct on the mainland within the last 40 years (the last mainland specimen being a road-killed specimen was in 31 January 1963 in Vaucluse, Sydney), although there are numerous unconfirmed reports of the species since then (C. Rehberg pers. comm.). The species is now present only in Tasmania and on Bruny Island, where it may have been introduced. It is widespread within Tasmania, but its distribution is patchy (Maxwell et al. 1996).