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Hanover Township was formed from the southern portion of Allen Township by decree of the Bucks County Court in 1798. Its geographic limits at that time included the present area plus that which comprises Hanover Township, Northampton County, and the area immediately south of the current Township to the Lehigh River. This original territory was retained until 1812 when Lehigh County was established and the Township was divided; approximately two-thirds of its area went to Lehigh County and one-third remained in Northampton County.