It will be useful essentialy for admin.
Because for example when a customer ask for a quote we have his post code for example 14610. In France the first 2 numbers is the département. So we know the number but not the name.
So two way to respond the demand :
1) If we enter for exemple 50250 you made a way “Manche” automaticaly in state
2) You put the number before the name of the département so it is easy to find the département in the list. For exemple “50-Manche” Of course I understand the number will appear before the name of the dépatements but it will be useful.
At this link you have all the number of french departements : https://www.regions-et-departements.fr/departements-francais
Kind regards
Xavier