How many digits is a Chinese postal code?

A Chinese postal code is always exactly six digits with no spaces or letters. There is no check digit, so validation confirms format and that the leading digit corresponds to an in-use postal zone.

What do the digits mean?

The codes are hierarchical: the first digit is the broad postal zone, the first two digits indicate the province or directly-administered municipality, the third and fourth identify the prefecture or city, and the last two identify the delivery office.

Is there a checksum to verify?

No. Unlike business or ID numbers, Chinese postal codes carry no check digit. The best automated validation is to confirm the six-digit format and that the prefix maps to a real postal region, which is exactly what this tool does.

Why is Beijing 100000?

Codes beginning with 10 belong to the Beijing postal zone, with 100000 used as a general Beijing code. The leading 1 marks the North China zone, and 10 narrows it to the capital.

Does a valid format mean the address exists?

No. A correctly formatted code in an active zone does not guarantee the specific street or building exists. For precise delivery routing, confirm the full address against China Post or your carrier.

China Postal Code Validator

Chinese postal codes (邮政编码) are six-digit numbers used throughout e-commerce checkout and logistics in China. They carry no check digit, so the most useful validation is confirming the format and decoding the geographic prefix. This tool does both entirely in your browser.

How it works

The six digits are hierarchical:

Digit 1 — the broad postal zone (for example, 1 = North China, 2 = Northeast, 3 = East China).
Digits 1–2 — the province or directly-administered municipality.
Digits 3–4 — the prefecture or city.
Digits 5–6 — the local delivery office.

Validation confirms the code is exactly six digits, rejects the reserved leading digits 0 and 9, and then maps the prefix to a postal zone and province so you can sanity-check that the code matches the intended destination.

Notes

Because there is no checksum, a “valid” result means a well-formed code in an active zone, not a guaranteed deliverable address. The province mapping is indicative; the precise delivery area depends on all six digits. For authoritative routing, confirm against China Post.