Close to half of Shanghai population are migrants according to the release of the National Population and Family Planning Commission of China on October 30. Shanghai has a population of approximately 18.6 million. 8.6 million of it are migrants. 70% of these migrants are from adjacent provinces of Anhui, Jiangsu, Sichuan, Zhenjiang and Jiangxi. This large migrant population in Shanghai has been the priority and problem area for the National Population and Family Planning Commission of China to ensure compliance of one-child policy.
Source: Xinhua, October 30, 2008
http://news.xinhuanet.com/newscenter/2008-10-30/content_10281899.htm