Some clubs have region base signings. Like Bilbao, but Bilbao has it implementet with Basque nationality. Other clubs like my local club Ranheim has a philosophy to have 96% of players from the Trøndelag region in Norway. So my suggestion is to have a option to search for players in regions and not cities. Like if I search for Trøndelag i get all the players born in cities in Trøndelag (Trondheim, Oppdal, Levanger, Stjørdalen etc.).