section_path: Demographics
section_name: Demographics
paragraph_text: Demographics
  
  A population estimate for the empire of 11,692,480 for the 1520–1535 period was obtained by counting the households in Ottoman tithe registers, and multiplying this number by 5. For unclear reasons, the population in the 18th century was lower than that in the 16th century. An estimate of 7,230,660 for the first census held in 1831 is considered a serious undercount, as this census was meant only to register possible conscripts.
  
  Censuses of Ottoman territories only began in the early 19th century. Figures from 1831 onwards are available as official census results, but the censuses did not cover the whole population. For example, the 1831 census only counted men and did not cover the whole empire. For earlier periods estimates of size and distribution of the population are based on observed demographic patterns.
  
  However, it began to rise to reach 25–32 million by 1800, with around 10 million in the European provinces (primarily in the Balkans), 11 million in the Asiatic provinces, and around 3 million in the African provinces. Population densities were higher in the European provinces, double those in Anatolia, which in turn were triple the population densities of Iraq and Syria and five times the population density of Arabia.
  
  Towards the end of the empire's existence life expectancy was 49 years, compared to the mid-twenties in Serbia at the beginning of the 19th century. Epidemic diseases and famine caused major disruption and demographic changes. In 1785 around one-sixth of the Egyptian population died from the plague and Aleppo saw its population reduced by twenty percent in the 18th century. Six famines hit Egypt alone between 1687 and 1731 and the last famine to hit Anatolia was four decades later.
  
  The rise of port cities saw the clustering of populations caused by the development of steamships and railroads. Urbanization increased from 1700 to 1922, with towns and cities growing. Improvements in health and sanitation made them more attractive to live and work in. Port cities like Salonica, in Greece, saw its population rise from 55,000 in 1800 to 160,000 in 1912 and İzmir which had a population of 150,000 in 1800 grew to 300,000 by 1914. Some regions conversely had population falls—Belgrade saw its population drop from 25,000 to 8,000 mainly due to political strife.
  
  Economic and political migrations made an impact across the empire. For example, the Russian and Austria-Habsburg annexation of the Crimean and Balkan regions respectively saw large influxes of Muslim refugees—200,000 Crimean Tartars fleeing to Dobruja. Between 1783 and 1913, approximately 5–7 million refugees arrived into the Ottoman Empire. Between the 1850s and World War I, about a million North Caucasian Muslims arrived in the Ottoman Empire as refugees. Some migrations left indelible marks such as political tension between parts of the empire (e.g., Turkey and Bulgaria), whereas centrifugal effects were noticed in other territories, simpler demographics emerging from diverse populations. Economies were also impacted by the loss of artisans, merchants, manufacturers, and agriculturists. Since the 19th century, a large proportion of Muslim peoples from the Balkans emigrated to present-day Turkey. These people are called Muhacir. By the time the Ottoman Empire came to an end in 1922, half of the urban population of Turkey was descended from Muslim refugees from Russia.