Mons
Administration communale de Mons – Population, État civil et Étrangers
Rue Buisseret 2, 7000 Mons
Declare your move online with eID or itsme, and make your name and house number visible for the police visit.
Prepare identity/residence cards or loss/theft declarations and the actual new address. For the chip update, bring all affected household cards and their PINs. For separated parents, provide relevant child-residence agreements or judgments. After an administrative deletion, an invalidated card needs replacement, not just a chip update.