03 stands for Shanxi Province, 0 stands for postal area, 6 stands for Jinzhong City, and 00 is the delivery office where the specific county in Jinzhong is located.
China postal code adopts four-level six-digit coding structure. The first two figures represent provinces (cities, autonomous regions); The first three digits indicate the postal area; The first four digits represent counties (cities); The last two digits indicate the office.
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Postal code source
1June, 963, in order to meet the rapidly growing demand for mail delivery at that time, the postal code was born in the United States, and the United States became the first country in the world to have a postal code.
Postal code is a scheme to realize automatic sorting of letters, because computers can't recognize Chinese, but they can recognize numbers. By coding each area, you can quickly sort it by computer. Of course, the finer you write, the better.
Baidu encyclopedia-postal code
Baidu encyclopedia-Jinzhong