Xi County is subordinate to Xinyang City, Henan Province. In the southeast of Henan Province and in the northeast of Xinyang City, it crosses the Huaihe River from north to south, borders Dabie Mountains in the south, borders Huanghuaihai Plain in the north, borders Luhe River in the east, faces Huaibin County, Huangchuan County in the southeast, Guangshan County in the south, Luoshan County in the southwest, Zhengyang County in Zhumadian City in the west and northwest, and Xincai County in Zhumadian City in the north. The total area is 1892 square kilometers. As of June 2020, it has jurisdiction over 3 streets, 6 towns, 12 townships and 1 township level unit. According to the data of the seventh census, as of 0:00 on November 1, 2020, the permanent population of Xixian County is 666200.

Zhou was the first time to establish the country of interest. In the fifteenth year of King Zhouzhuang (682 BC), the State of Chu established Xi County. In 1998, it was changed to Xinyang City. Beijing Guangzhou Highway, 230 National Highway, Ningxi Railway, Daqing Guangzhou Expressway, Xi'an-Xi'an Expressway, Anluo Expressway and Pu'an-Huang'an Railway pass through Xixian County.

In 2019, the GDP of Xixian County was 25.39 billion yuan, the investment in fixed assets increased by 13.9%, the total retail sales of consumer goods increased by 10.3%, the general public budget revenue increased by 19.3%, and the general public budget expenditure increased by 41.7%.