GeoNames
Post code data for every country, under Creative Commons Attribution 4.0.
App for Business Central
Post codes that fill themselves in
Business Central fills in city and county the moment someone types a post code, but only if the post code table has data in it. Postcode Atlas puts it there, from official sources, one country at a time.
In a new company the post code table is empty, so everyone types the city themselves, with all the spelling that comes with that. Postcode Atlas puts official post code data in, so that city and county follow from the post code rather than from the memory of whoever is creating the customer. You choose which countries, because a Dutch wholesaler has no use for 1.7 million British post codes.
What is in the app
The country list, the coverage per country and the origin of the data are visible inside the app as well, on the Post Code Countries page.
- Countries
- 121
- Post codes
- 4,011,134
- Netherlands
- 468,791 six-character codes with BAG place names and province
- Great Britain
- 1,748,765 units with post town and county
- Data in the app
- 133 MB of text, 16 MB after compression
How it works
Install
The app adds one list: Post Code Countries. Nothing is loaded yet. The app does not touch your post code table until you ask it to.
Choose countries
Select the countries you do business with. Per country you see how many post codes are available, how complete the coverage is and which source the data comes from.
Load
Loading runs in the background through the job queue, so nobody sits waiting. After that Business Central fills in city and county itself on every customer, vendor, contact and address.
What to watch out for
Post codes are stored per company, not per environment: four companies in the same tenant means the same rows four times over. For the Netherlands with 468,791 codes that goes unnoticed; for Great Britain with 1,748,765 units it does not. So load only the countries you actually invoice into. A country you no longer need comes out again with a single action.
Where the data comes from
Two sources, both under a licence that permits commercial reuse provided the source is credited. That credit is shown per country inside the app, so it travels with the data instead of living only on this page.
Ordnance Survey Code-Point Open
The British post code units. Contains OS data © Crown copyright and database right 2026, under the Open Government Licence v3.
Frequently asked questions
Does loading overwrite my own post codes?
Yes. Loading replaces: the app first removes the post codes the company holds for that country, including ones somebody entered by hand. That is why the app asks for confirmation first and tells you the count. Export the Post Codes table to Excel if you are unsure.
Does this work in a company that is already live?
Yes, but read the previous answer. In a company that already has post codes, loading is a replacement and not a top-up. In a fresh company there is nothing to lose.
Can I take a country out again?
Yes, with the Remove Post Codes action. If there are post codes this app did not load, the app warns about those separately, because it cannot put them back.
How current is the data?
The app carries the latest GeoNames and Code-Point Open release available when that version was built. A new app version brings new data, but it does not touch loaded post codes until you load a country again.
Terms, privacy and manual
These three are about the app and not about this website, so they are kept separate. The privacy statement and terms for van-oosten.nl itself are at the bottom of every page.
A question about Postcode Atlas
Not sure whether this fits your setup, or missing a country? Ask, and you will usually have an answer within one working day.