Why do Jiande people say they are from Hangzhou?

Because Jiande belongs to Hangzhou area.

Hangzhou is a region of Zhejiang Province, including Hangzhou, and its area is still very large. Linping in Yuhang District in the north, Fuyang District in the west, Lin 'an City, Tonglu County, jiande city, Qiandao Lake and Xiaoshan District in the east all belong to Hangzhou, so it is not wrong for Jiande people to say that they are from Hangzhou.

1in the winter of 974, experts from vertebrate paleontology Institute of Paleoanthropology of China Academy of Sciences and Zhejiang Museum unearthed an ancient human tooth fossil and a large number of ancient vertebrate fossils in Wuguidong, Xinqiao Village, Lijia Town, jiande city.