Yuen Long District (Chinese: 元朗區, Jyutping: jyun4 long5, pinyin: Yuánlǎng, used to be known as Un Long), is one of the districts of Hong Kong located in the northwest of the New Territories. It had a population of 449,070 in 2001. The district has the youngest population of Hong Kong and the lowest income in the New Territories.