Willow Street is a census-designated place (CDP) in Lancaster County, Pennsylvania, United States. The population was 8,908 at the 2016 census. In the early part of the 20th century the main thoroughfare in town was lined with willow trees on both sides for the length of the town, hence the community's name. As time marched on and the town grew, the road was widened and sidewalks were installed which required the trees be removed. Only a few of the original trees remain to this day.
It is the location of the Hans Herr House, the oldest homestead in Lancaster County.
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