Kuala Lumpur - Wikipedia Kuala Lumpur (KL), [a] officially the Federal Territory of Kuala Lumpur, [b] is the capital city and a federal territory of Malaysia It is the most populous city in the country, covering an area of 243 km2 (94 sq mi) with a population of 2,111,536 [9] as of 2026 [10] Greater Kuala Lumpur, which itself includes the Klang Valley, is an urban agglomeration of 8 81 million people as of 2024 It