The demographics of Malaysia are represented by the multiple ethnic groups that exist in the country. Malaysia's population, according to the 2010 census, is 28,334,000 including non-citizens, which makes it the 42nd most populated country in the world. Of these, 5.72 million live in East Malaysia and 22.5 million live in Peninsular Malaysia. The population distribution is uneven, with some 79% of its citizens concentrated in Peninsular Malaysia, which has an area of 131,598 square kilometres (50,810.27 sq mi), constituting under 40% of the total area of Malaysia.

Malaysia is a country in Southeast Asia. The federal constitutional monarchy consists of 13 states and three federal territories, separated by the South China Sea into two regions: Peninsular Malaysia and Borneo's East Malaysia. Peninsular Malaysia shares a land and maritime border with Thailand and maritime borders with Singapore, Vietnam, and Indonesia. East Malaysia shares land and maritime borders with Brunei and Indonesia, as well as a maritime border with the Philippines and Vietnam. Kuala Lumpur is the national capital, the country's largest city, and the seat of the legislative branch of the federal government. Putrajaya is the administrative centre, which represents the seat of both the executive branch and the judicial branch of the federal government. With a population of over 33 million, the country is the world's 43rd-most populous country. Malaysia is tropical and is one of 17 megadiverse countries; it is home to numerous endemic species. Tanjung Piai in the Malaysian state of Johor is the southernmost point of continental Eurasia.