Trappe is a borough in Montgomery County, Pennsylvania, United States. The population was 3,509 at the 2010 census. Augustus Lutheran Church, built in 1743, is the oldest unchanged Lutheran church building in the United States in continuous use b…Trappe is a borough in Montgomery County, Pennsylvania, United States. The population was 3,509 at the 2010 census. Augustus Lutheran Church, built in 1743, is the oldest unchanged Lutheran church building in the United States in continuous use by the same congregation. It has been designated a National Historic Landmark.
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