Demographics
South Korea is noted for its population density, which is 487 per square kilometer, more than 10 times the global average. Most South Koreans live in urban areas, due to rapid migration from the countryside during the country's quick economic expansion in the 1970s, 1980s and 1990s. The capital city of Seoul is also the country's largest city and chief industrial center. According to the 2005 census, Seoul had a population of 9.8 million inhabitants. The Seoul National Capital Area has 24.5 million inhabitants making it the world's second largest metropolitan area and easily the most densely populated city in the OECD. Other major cities include Busan (3.5 million), Incheon (2.5 million), Daegu (2.5 million), Daejeon (1.4 million), Gwangju (1.4 million) and Ulsan (1.1 million).
The population has also been shaped by international migration. After World War II and the division of the Korean Peninsula, about four million people from North Korea crossed the border to South Korea. This trend of net entry reversed over the next 40 years due to emigration, especially to the United States and Canada. South Korea's total population in 1955 was 21.5 million, and today it is roughly 50,062,000.
South Korea is one of the most ethnically homogeneous societies in the world, with more than 99% of inhabitants having Korean ethnicity. Koreans call their society 단일민족국가, Dan-il minjok guk ga, "the single race society".
The percentage of foreign nationals has been growing rapidly. As of 2009, South Korea had 1,106,884 foreign residents, 2.7% of the population; however, more than half of them are ethnic Koreans with a foreign citizenship. For example, migrants from China (PRC) make up 56.5% of foreign nationals, but approximately 30% of the Chinese citizens in Korea are Joseonjok (조선족 in Korean), PRC citizens of Korean ethnicity. Regardless of the ethnicity, there are 28,500 US military personnel serving in South Korea for one year of unaccompanied tour, according to the Korea National Statistical Office. In addition, about 43,000 English teachers from English-speaking countries reside temporarily in Korea. Currently, South Korea has one of the highest rate of growth of foreign born population, with about 30,000 foreign born residences obtaining South Korean citizenship every year since 2010.
South Korea's birthrate was the world's lowest in 2009. If this continues, its population is expected to decrease by 13% to 42.3 million in 2050. South Korea's annual birthrate is approximately 9 births per 1000 people. However, the birthrate has increased by 5.7% in 2010 and Korea no longer has the world's lowest birthrate. According to a 2011 report from Chosun Ilbo, South Korea's total fertility rate (1.23 children born per woman) is higher than those of Taiwan (1.15) and Japan (1.21). The average life expectancy in 2008 was 79.10 years, which is 34th in the world.
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