These days, the former site of Edo-jo Castle in Tokyo is called Kokyo, which was formally called Kyujo (place where the Emperor lives) but the name was abolished after World War II.
現在は、第二次世界大戦後に宮城（きゅうじょう）の名称が廃止された東京の江戸城跡一帯を指して皇居と呼んでいる。