Jiashan County, under the Jiaxing City of Zhejiang Province. Located in the northeast of Jiaxing City, Jiangsu, Zhejiang and Shanghai two provinces and one city intersection, the outline of the boundary is field shape, east of Shanghai Qingpu, Jinshan District, south of Pinghu City, Nanhu District of Jiaxing city, west of Jiaxing Xiuzhou District, Jiangsu Province Suzhou Wujiang District and Shanghai Qingpu District, a total area of more than 500 square kilometers. According to the seventh census, Jiashan County had a permanent population of 648,160 as of midnight on November 1, 2020.

Jiashan County is located in the core area of the Yangtze River Delta urban agglomeration, of which the water area accounts for 14.29%. The territory of the water network interwoven, rich products. The people are simple and simple, known as the land of fish and rice, the house of silk, and the land of culture. It is the county's high-quality development demonstration site and the second batch of pilot areas of Zhejiang's high-quality development and Construction Demonstration zone for common prosperity. The Overall Plan of the Yangtze River Delta Eco-Green Integrated Development Demonstration Zone has identified Xitang Town and Yaozhuang Town of Jiashan County as the pilot areas of the integrated demonstration zone.

In 2020, the GDP of Jiashan County reached 65.577 billion yuan, an increase of 8.0% based on comparable prices.