Then in 1920 was changed to Tunghsiao Hamlet in Miaoli Prefecture, Hsinchu County. It was not until 1950 that it was changed to Tunghsiao Town, Miaoli County.
光緒卅年，通霄編入新竹縣，改設通霄街；民國九年改為新竹州苗栗郡通霄莊；直到民國卅九年，才改為苗栗縣通霄鎮。