In 1904, the western part of the diocese was separated to form the Diocese of Harrisburg. This left the eastern part of the diocese, now based in Bethlehem, covering a territory that "the name lost much of its significance."
In 1904, the western portion of the diocese was split off to create the Diocese of Harrisburg. This resulted in the eastern part of the diocese, now centered in Bethlehem, covering an area where the name had lost much of its importance.