 Although there are many who believe Allegheny Township was formed in 1796, it appears, according to available records, that the Township was actually formed from Washington Township in 1820.At its formation, Allegheny Township included what is now Lower Burrell, Hyde Park, Vandergrift, West Leechburg, Arnold and New Kensington.There had been an earlier Allegheny Township formed by the Westmoreland County Court of Quarter Sessions in December 1795, north of the Kiskiminetas River in what is now known as Armstrong County.