Sanchong District (Chinese: 三重區; pinyin: Sānchóng Qū; Pe̍h-ōe-jī: Sam-tiông-khu) is a district in the western part of New Taipei City, Taiwan. With an area of 16.32 km2 and a population of 380,699 people (February 2023), it has the fourth highest population density in Taiwan and 23rd highest in the world,[2] with over 23,900 people per km2.
Sanchong was called Satengpo (Chinese: 三重埔; Pe̍h-ōe-jī: Saⁿ-têng-po͘ / Sam-tiông-po͘),[3] which literally means "The Third Plain" by the early settlers. The settlers from the modern-day Xinzhuang area moved up north and named the plains they settle as "The First Plain" (頭前埔, located in modern-day Xinzhuang District), "The Second Plain" (二重埔, located in modern-day Sanchong) and The Third Plain.
As of October 2015, there were 388,550 people living in the district.[4]
The 2010 Population Census[5] reported that Sanchong has a population of 390,904. The population density was 24,172.6 inhabitants per square kilometer.