Selangor is Malaysia's most populous state, largely thanks to the rapid economic growth taking place there, mostly propelled by industry, and the growth of the Kuala Lumpur conurbation (known as the Klang Valley, due to its sprawl within the floodplain of Klang River).
The population in the year 2002 was 3,985,567. Selangor's ethnic composition in 2005 was: Malays (1,220,130 or 41%), Chinese (898,556 or 37%), Indians (465,213 or 19%), Others (337,971).
Selangor's population growth is fed by the influx of people from other states notably the northern state of Kedah and the east-coast states of Kelantan and Terengganu. The migrants largely consist of young people, who are attracted by higher wages and a better quality of life in Selangor.
There are also sizable population of foreign workers from Indonesia, The Philippines, Vietnam, Myanmar, Bangladesh, India, Pakistan, and China.