According to Baidu Encyclopedia, Hexi District, to which Tianjin belongs, is one of the downtown areas of Tianjin and the seat of the party, government and military organs of Tianjin. Hexi district administrative division code: 120 103, administrative category: municipal district, telephone area code: 022, postal code: 300202, license plate code: Tianjin, from which we know that the postal code of Hexi district is 300202.

Hexi District is named after its location on the west bank of Haihe River. In 33 years of the Republic of China (1944), the Japanese puppet municipal authorities merged the six districts and the ten districts, and still called the six districts. 1956, the sixth district was renamed Hexi district. Hexi District includes: Tianjin Medical University, Tianjin University of Finance and Economics, Tianjin University of Science and Technology, Tianjin Foreign Studies University and Tianjin Institute of Physical Education. Hexi District is a national civilized city, a national sanitary city, a "waste-free city" during the Tenth Five-Year Plan period, and a national double-support model city.