Susquehanna Township is a township in Dauphin County, Pennsylvania, United States. The population was 26,736 at the time of the 2020 census. This represents a 11.2% increase from the 2010 census count of 24,036. Susquehanna Township has the postal ZIP codes 17109 and 17110, which maintain the Harrisburg place name designation. The townshi…Susquehanna Township is a township in Dauphin County, Pennsylvania, United States. The population was 26,736 at the time of the 2020 census. This represents a 11.2% increase from the 2010 census count of 24,036. Susquehanna Township has the postal ZIP codes 17109 and 17110, which maintain the Harrisburg place name designation. The township is a suburb of Harrisburg and is connected to Marysville by the Rockville Bridge, the world's longest stone-arch rail bridge at the time of its completion.
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