Jarrettown is an unincorporated community located in Montgomery County, Pennsylvania, United States. The community is in Upper Dublin Township, 2.2 miles east of the Borough of Ambler and 2.75 mile…Jarrettown is an unincorporated community located in Montgomery County, Pennsylvania, United States. The community is in Upper Dublin Township, 2.2 miles east of the Borough of Ambler and 2.75 miles southwest of Horsham.
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