Allegheny Township, Armstrong County, Pennsylvania

Allegheny Township, established on December 6, 1795, in Westmoreland County, Pennsylvania, was among the earliest administrative divisions in Western Pennsylvania. Covering a vast area, it included much of what would later become Armstrong County when the county was established in 1800. Named for the Allegheny River, which formed its western boundary, the township played a central role in the settlement, agricultural development, and industrialization of the region.

By the late 19th century, the growth of population and industry led to the subdivision of Allegheny Township into smaller municipalities. These included Kiskiminetas, Burrell, Bethel, Parks, and Gilpin Townships, as well as boroughs such as Leechburg and Aladdin. By 1878, Allegheny Township ceased to exist as an independent administrative entity, but its legacy continues through its descendant communities.