The demographic characteristics of the population of Croatia are known through censuses, normally conducted in ten-year intervals and analysed by various statistical bureaus since the 1850s. The Croatian Bureau of Statistics has performed this task since the 1990s. The latest census in Croatia was performed in autumn of 2021. According to final results published on 22 September 2022 the permanent population of Croatia at the 2021 census (31st Aug) stood at 3.87 million. The population density is 68.7 inhabitants per square kilometre, and the overall life expectancy in Croatia at birth was 78,2 years in 2018. The population rose steadily (with the exception of censuses taken following the two world wars) from 2.1 million in 1857 until 1991, when it peaked at 4.7 million. Since 1991, Croatia's death rate has continuously exceeded its birth rate; the natural growth rate of the population is negative. This population drop is also caused by emigration rates. Because of this, Croatia's population fell below 4 million again in 2018, and the apex of its mass emigration occurred in 2022, while population didn't increase again until 2023 due to immigration compensating for the negative natural change. Croatia is in the fourth (or fifth) stage of the demographic transition. In terms of age structure, the population is dominated by the 15 to 64 year‑old segment. The median age of the population is 43.4, and the gender ratio of the total population is 0.93 males per 1 female.
Croatia is inhabited mostly by Croats (91.63%), while minorities include Serbs (3.2%), and 21 other ethnicities (less than 1% each). The demographic history of Croatia is marked by significant migrations, including the arrival of the Croats in the area growth of Hungarian and German-speaking population since the union of Croatia and Hungary, and joining of the Habsburg Empire, migrations set off by Ottoman conquests and growth of Italian speaking population in Istria and in Dalmatia during Venetian rule there. After the collapse of Austria-Hungary, the Hungarian population declined, while the German-speaking population was forced or compelled to leave after World War II and similar fate was suffered by the Italian population. Late 19th century and the 20th century were marked by large scale economic migrations abroad. The 1940s and the 1950s in Yugoslavia were marked by internal migrations in Yugoslavia, as well as by urbanisation. Recently, significant migrations came as a result of the Croatian War of Independence when hundreds of thousands were displaced, while the 2010s brought a new wave of emigration which strengthened after Croatia's accession to the EU in 2013.
