Guannan County, subordinate to Lianyungang City, Jiangsu Province, is located in the northeast of Jiangsu Province, in the south of the Huanghuai Plain, bordering Xiangshui County in the east, Lianshui County in the south, Shuyang County in the west, and Guanyun County across the Xinyi River in the north. It is the south gate of Lianyungang City, with a total area of 1029.88 square kilometers. As of June 2020, Guannan County has 11 towns under its jurisdiction. According to the data of the seventh population census, as of 0:00 on November 1, 2020, the permanent population of Guannan County was 612345.

Guannan, also known as "Haixi" and "Huize" in ancient times, is named after its location in the Guanhe River basin and south of Guanyun County. In November 1957, the State Council adopted the "Decision on the Establishment of Guannan County in Jiangsu Province". On March 1, 1958, the construction of Guannan County was completed and officially started. A large number of revolutionaries such as Hui Yuyu, Zhou Hui, Rui Xingwen and Tang Shuhong were born in Guannan, and many literary and artistic masters such as Wang Xiaogu, Wang Yongmei and Ji Daoqing were cultivated. The water transport culture, the Grand Canal culture, the red culture, and the Western Journey culture blend and reflect each other. Guannan is a civilized city in Jiangsu Province and a nominated city for a national civilized city. It has successively been rated as a national sanitary city, a national greening model county, a national export food and agricultural product quality and safety demonstration area, a national e-commerce comprehensive demonstration county in rural areas, and a national edible fungus factory production demonstration county. Tanggou Liquor, a famous specialty, is a time-honored brand of China, a product of national geographical indication, and a product exempted from inspection by national quality certification. It was awarded the gold medal of China Famous and Excellent Liquor Expo.

In 2021, Guannan County will achieve a GDP of 42.8 billion yuan, an increase of 11%; The general public budget revenue was 2.72 billion yuan, up 13.6%; Investment in fixed assets was 16.2 billion yuan, up 23.7%; The total import and export volume of foreign trade was 230 million US dollars, up 29.6%; The actual utilization of foreign capital was 122 million US dollars, up 42%; The per capita disposable income of residents reached 26328 yuan, up 8.1%.