95.3% of the population only speak English at home, with the most common languages spoken other than English being Mandarin, German and French. The median age of Killcare Heights is 47, significantly above the median age of NSW and Australia, which is 38.
41.4% of the population described themselves as without a religion; 21.1% described themselves as Catholic, and 17.1% as Anglican. Other residents have described themselves as members of the Uniting Church in Australia, Presbyterian church or Pentecostal church.
^In accordance with the Australian Bureau of Statistics source, England, Scotland, Mainland China and the Special Administrative Regions of Hong Kong and Macau are listed separately