Ethnic groups: 409,786 ethnic Russians are the largest group, followed by 24,993 Koreans (see Sakhalin Koreans), 12,136 Ukrainians and many smaller ethnic groups, including 219 Japanese and Ainu (0.05%), who were native to the region and opposed the Soviet Union taking the territory after World War II. The ethnic groups of the oblast in 2010 were:
↑Президент Российской Федерации.Указ№849от13 мая 2000 г. «О полномочном представителе Президента Российской Федерации в федеральном округе». Вступил в силу13 мая 2000 г. Опубликован: "Собрание законодательства РФ", №20, ст. 2112, 15 мая 2000 г. (President of the Russian Federation.Decree#849ofMay 13, 2000 On the Plenipotentiary Representative of the President of the Russian Federation in a Federal District. Effective as ofMay 13, 2000.).
↑Госстандарт Российской Федерации.№ОК 024-9527 декабря 1995 г. «Общероссийский классификатор экономических регионов. 2.Экономические районы», в ред. Изменения №5/2001 ОКЭР. (Gosstandart of the Russian Federation.#OK 024-95December 27, 1995 Russian Classification of Economic Regions. 2.Economic Regions, as amended by the Amendment#5/2001 OKER. ).
↑The density value was calculated by dividing the population reported by the 2010 Census by the area shown in the "Area" field. Please note that this value may not be accurate as the area specified in the infobox is not necessarily reported for the same year as the population.
↑Official throughout the Russian Federation according to Article68.1 of the Constitution of Russia.