As of the end of 2011, the total population of Seoul was 10,528,774, or 0.44% less compared to last year.
According to a population survey of registered residents conducted at the end of 2011, Seoul had 46,673 fewer inhabitants than at the end of last year. The survey showed that this is largely because more people have moved from Seoul to another city or province compared to those in other cities, and not because there were any significant changes in the birth and death rates.
By contrast, the number of registered foreigners has continued to rise. As of the end of 2011, the total number of registered foreigners rose by 16,193 to 279,095 compared to last year, representing a fourfold increase from ten years ago.
By nationality, the number of Russian residents rose most markedly (up 34.9%), followed by Chinese (17.1%), British (15.2%), and Japanese (11.8%), while the number of Americans dropped by 9.3%, Canadians by 5.1%, and Uzbeks by 0.7%.
With the aging of the population, the number of people over the age of 65 rose by 41,853 compared to last year, to 1,049,425, accounting for 9.97% of the total population.
The Aging Index, which represents the portion of the population aged 65 or older relative to those aged 14 or under, currently stands at 75.5 and is continuing to rise. The Aging Index in 2001 was 31.3 in 2001, which means it rose 2.4 times in just ten years.
The average age of the total population is currently 38.3, which is 3.2 years higher than in 2005, when the average was 35.1.
The female-to-male ratio has also been on the increase since 2003, and currently stands at 102 females to 100 males.
The survey highlighted the fact that in the 75+ age group, there are 147 females to every 100 males, while there are 3.18 more females than males in the 95+ age group.
At 178,386, Korean-Chinese make up the majority of the foreigners currently living in Seoul.