China adopts a four-level six-digit coding system, with the first two representing provinces (municipalities and autonomous regions), the third representing postal areas and the fourth representing counties (cities), and the last two representing which delivery area of the city the delivery area is located.

For example: 262403

Top two: Shandong 25-27

Two places: Weifang 10-27

Fourth place: Changle County 4

The last two: Yaogou Town 03