million as of 2007 and Vivacom over 1 million. HIV Bulgaria's HIV rate is among the lowest in the world, being 0.1% or 3,800 infected as of 2009. Urbanization Most Bulgarians (72.5 per cent) reside in urban areas. Approximately one-sixth of them live in Sofia, which has a population exceeding 1,200,000 people. Urban population: 5,338,261 or 72.5% of total population (Census 2011) Rural: 2,026,309 or 27.5% Rate of urbanization: -0.3% annual rate of change (2005–10 est.) See also Immigration to Bulgaria Immigration to Europe List of countries by immigrant population Bulgaria Ageing of Europe Notes References External links 2005 Report on European Demography, Eurostat Annual report of the National Statistics Institute for 2005 regarding population and demographic processes Urbanization,1910-1946 Bulgarian Subject Files – Social Issues: Minorities, Blinken Open Society Archives, Budapest Bulgarians – Species on the Brink Society of Bulgaria