Harmony Township was formed in 1851 from Economy Township. All of Harmony
Township was at one time owned by the Harmony Society from which it derived
its name. Ambridge became a borough in its own right in 1902-1903, when the
Harmony Society sold more than 2,500 acres as a site for a bridge building
plant and town. It was shortly thereafter named Ambridge, taking its name
from the American Bridge Company, the first large industry. In May, 1905,
the Borough of Ambridge was incorporated, formed from the communities of Economy
and Ambridge. Economy Borough borders the neighborhood on the east and northeast
and Baden Borough borders on the north.
