The first two postal codes represent provinces, autonomous regions and municipalities directly under the central government, and 25 represents Jinan City, Shandong Province; The third digit represents the postal code, and 0 represents Huaiyin District; The fourth digit represents the city (county) number; The last two represent the mail delivery office and the office. So the postcode of Huaiyin District is 250000.

Huaiyin District belongs to Jinan City, Shandong Province, and is the central city of Jinan City. Located in the west of Jinan City, it faces Qihe County of Dezhou City across the Yellow River in the north, adjacent to the downtown area in the south, tianqiao district and the downtown area in the east and Changqing District in the west. It is located between 36 37'-36 45' north latitude and116 47' 40 "-16 59' east longitude, and the maximum horizontal distance from east to west is about 15.3km, north to south.

The Historical Evolution of Huaiyin District

1955 according to the instruction of "municipal districts should be changed to place names" in the State Council, the sixth district with more streets and lanes named after Sophora japonica was changed to Huaiyin district.

Division 1956, jurisdiction: north to jinpu railway, south to Shandong cement plant (now Jinan cement plant); Wei Wu Road in the east and Jinpu Railway in the west.

At the end of 1959, the division was adjusted to: Jingyi Road in the north and Shandong Cement Plant (now Jinan Cement Plant) in the south; From Minquan ditch in the east to Jinpu Railway in the west.

1960, and the division is adjusted to: north to Jinpu Railway, south to Shandong Cement Plant (now Jinan Cement Plant); It starts from Wei Wu Road in the east and reaches Xinhe Circle Village in the west.

1978 Regionalization adjustment, jurisdiction: from the intersection of Dikou Road and Zhangzhuang Road in the north to Liu Changshan in the south; It starts from Wei Wu Road in the east and reaches Jixing River in the west.

1987, the division is adjusted as follows: Yellow River in the north and Woniu Mountain in the south; It starts from Wei Wu Road in the east and reaches Xinhe Circle Village in the west.

Reference to the above content: Baidu Encyclopedia-Huaiyin District