High Quality Content by WIKIPEDIA articles! Scientology has been in Australia since the mid 1950s. Their numbers vary depending upon the source: according to the 2007 census it has a growing population, 2507 members, up from 1489 ten years ago , while Scientology itself has claimed 150,000 members in Australia. It has headquarters in Sydney, Melbourne, Perth, Adelaide and Canberra and has a mission in Tasmania. The Church of Scientology Australia is the regional headquarters for the entire Asian and Pacific area.