Haimen, Nantong

Haimen
海门区
Nickname: 
The River Gateway to the Sea (江海门户)
Haimen in Nantong
Haimen
Location of the city center in Jiangsu
Coordinates: 31°52′08″N 121°10′55″E / 31.869°N 121.182°E / 31.869; 121.182
CountryPeople's Republic of China
ProvinceJiangsu
Prefecture-level cityNantong
Established (as a county)958
Became independent subprefecture1768
Became county-level cityJune 1994
Became districtJuly 2020
SeatHaimen Town
Government
 • Deputy MayorLu Yifei (陆一飞) (Chinese Communist Party)
Area
 • Total
1,148.77 km2 (443.54 sq mi)
Elevation
4.96 m (16.3 ft)
Highest elevation
5.2 m (17 ft)
Lowest elevation
2.5 m (8.2 ft)
Population
 (2020 census)
 • Total
991,782
 • Density863.343/km2 (2,236.05/sq mi)
Time zoneUTC+8 (China Standard)
Postal code
226100
Area code0513
Websitewww.haimen.gov.cn

Haimen (simplified Chinese: 海门; traditional Chinese: 海門; pinyin: Hǎimén; lit. 'sea gate', Qihai dialect: [haɪ.məŋ], Shanghai: [hɛ̝.məŋ]) is a district of Nantong, Jiangsu province. Located on the northern bank of the Yangtze River estuary, it faces Shanghai across the river. Renowned as the "Gateway to the Yangtze River and the Yellow Sea" and "Little-Pudong", the district covers about 1,149 square kilometers and had a permanent population nearly 1 million in 2025. With its coastline along the Yangtze and the Yellow Sea, Haimen has historically been famous for fishing and salt production, and in modern times has developed into an important port-based industrial hub.