How to look up and update your new address after the province and ward mergers

Since 2025, Vietnam has merged a long list of provinces, wards and communes. The result is that a great many old addresses on paperwork, orders and contracts no longer match the new administrative units. If you are not sure which ward or commune your old address now belongs to, the tool diachi.io can look it up in a few seconds.

What can diachi.io do?

• Convert an old address into the new address created by the province, ward and commune mergers.
• Single lookup: type in the old address and get the matching new administrative address straight away.
• Bulk conversion: paste many addresses at once, handy for shops, delivery companies and accountants updating customer records.
• Free, runs directly in the browser, no app to install.

When do you need it?

When you reprint a contract, update a delivery address, file administrative paperwork, or fill in an online form that demands the correct new administrative unit name. Getting the new address wrong is an easy way to lose a parcel or have an application sent back.

How do you use it?

Go to diachi.io and type the old address into the lookup box; the system checks it against the latest administrative data and returns the matching address. If you have a large batch to process, use the bulk conversion mode. As someone who is always short on time, I prefer this to working through the merger tables by hand, it is faster and leaves far less room for mistakes.