It borders the prefecture-level cities of Taizhou and Nantong across the Yangtze River, as well as Wuxi to the west.

The area of the city was under jurisdiction of Jiyang township, Piling county during the Han dynasty.

The shoals formed by alluvial deposits in varying of shape and size border the Yangtze River were called shazhou in Chinese.

In 1962, Changshu and Jiangyin separated their owned parts to establish a county bearing Shazhou.

The land surrounding Zhangjiagang is extremely fertile, with large spans of rice paddies.

Many tributaries of the Yangtze have been contaminated from the construction and operation of chemical factories in the suburb areas.

The conceptualization of the port originated with urban city planner Wang Weifeng, PhD (王维锋], in 1986.

It is divided into 8 towns:[11][12]Besides, Changyinsha Modern Agriculture Demonstration Zone (常阴沙现代农业示范园区), Shuangshandao Island Tourist Resort (双山岛旅游度假区), (张家港经济技术开发区), (张家港保税区), (张家港市市稻麦良种场), (张家港市畜禽良种场), and (张家港市冶金工业园) are regarded as township level administrations with actual jurisdictions.

Calculated by the registered population, the per capita GDP is CN¥273,900, which is equivalent to US$39,700 at the average exchange rate.

Based on the permanent population, the per capita GDP is CN¥201,800, which is equivalent to US$29,300 at the average exchange rate.

[14] Zhangjiagang, like many regions in China, has its own unique dialect that differs from the standard Mandarin Chinese spoken throughout the country.

[15] It is the main local language of East China, and major cities include Shanghai, Suzhou, Hangzhou, and Wuxi.

[16] This dialect is characterized by its distinctive pronunciation and vocabulary, which differ from the standard Mandarin Chinese.

[18] Represented by Deji, Laosha dialect is distributed in Chenyang, Daxin, and other towns in the northwest, with the using population taking up about 20.76%.

As China continues to modernize and globalize, it will be interesting to see how these dialects evolve and adapt to changing circumstances.

[22] The city population is mainly consisted by the eight districts: Yangshe, Jingang, Jinfeng, Tangqiao, Fenghuang, Leyu, Nanfeng, and Daxin.

The majority of the population is concentrated in the Yangshe, Jingang, Tangqiao, and Jinfeng districts, indicating that these areas are the city's key residential and economic centers.