About this sound Daishan (Chinese: 岱山县; pinyin: Dàishān Xiàn) is a county under the jurisdiction of Zhoushan, Zhejiang Province. It covers a land area of 326 sq. kilometers and has a population of 200,000. The postal code is 316200, and the county seat is located on 88 Renmin Rd. in Gaoting Town. The county is located in East China Sea in northeast Zhejiang. It comprises a series of islands with Daishan Island forming the main part of the county.