data/zip_code/5000.json
{"5000000":{"code":"21201","old_zip_code":"500","zip_code":"5000000","pref_kana":"ｷﾞﾌｹﾝ","city_kana":"ｷﾞﾌｼ","town_kana":"ｲｶﾆｹｲｻｲｶﾞﾅｲﾊﾞｱｲ","pref_kanji":"岐阜県","city_kanji":"岐阜市","town_kanji":"以下に掲載がない場合","pref_roman":"GIFU KEN","city_roman":"GIFU SHI","town_roman":"IKANIKEISAIGANAIBAAI"}}