Thank you Dylan !
You are absolutely right. In many cases, queries on the sub_admin_code field are not as reliable as we would expect. But the adresses I have to filter are all located in Paris or its suburbs, and the information provided by Google is quite good in this area.
I tried more complex queries in order to achieve the same goal, but results were even less reliable. That’s why I finally decided to modify your code. Simpler query, better results !