SELECT county FROM table_name_68 WHERE listed = "09/21/1984" AND construction_completed = "07/19/2000"
Di daerah mana entri yang memiliki tanggal selesai konstruksi 07/19/2000 dan tanggal terdaftar 09/21/1984?
CREATE TABLE table_name_68 (county VARCHAR, listed VARCHAR, construction_completed VARCHAR)