The postal code of 100866 means that the postal code is all six digits, and the postal code of each place is different. One or two digits of the postal code represent provinces or municipalities directly under the central government. The third and fourth place represent the prefecture, city and state. The fifth and sixth people represent a county, a town or a residential area. Postal code is a special code representing the post office (office) that delivers mail. It is also the communication code of residents and units within the delivery range of this bureau (institute). Postal code consists of 6 Arabic numerals, such as 529000. Its first two digits represent Guangdong Province (autonomous regions and municipalities directly under the Central Government); The third digit indicates the postal code (Jiangmen); The fourth digit represents the city (county) number; The last two represent the mail delivery office and the office. Postal code 529000 represents the delivery area of Jiangmen City, Guangdong Province.

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