2011 Population Census: Fact Sheet for South Horizons in Southern District Council District. For the purpose of the 2011 census, each of the "Major Housing Estates", among which South Horizons was listed, so it had its own census data entry. Such estates were thus defined: "A group of residential buildings developed by the same developer (either in the public sector or in the private sector) in one or more phases in a neighbourhood and with at least 3,000 residents or 1,000 domestic households in 2011."