Historical chart of populations of the municipalities named Bethlehem (Pennsylvania) (1850-1910)

Reference 1: All Three boroughs, South Bethlehem, Original Bethlehem, West Bethlehem, Bethlehem West Bethlehem and Bethlehem Township.

Reference 2: 1850, 1860, 1870, 1880, 1890, 1900 and 1910.

Source: http://en.wikipedia.org/wiki/Bethlehem,_Pennsylvania